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(48一64.6÷3.4)×0.6的简便算法?
(48-64.6÷3.4)×0.6
34X7X15简便算法_34x15x7简便计算
=1/2+(1/3+2/3)+(1/4+2/4+3/4)+.....(1/10+2/10+....9/10)=55/2=(48-18.9)×0.6
=29.1×0.6
=17.46
(48一64.6÷3.4)×0.6
=(48一19)x0.6
= (30-1)x0.6
=30x0.6-1x0.6
=18-0.6
=17.4
(48-64.6÷3.4)×0.6
=(48-19)×0.6
=29×0.6
=17.4
(48-64.6/3.4)0.6
=(48-19)0.6
=290.40.41000÷(41×5)6
=17.4
(48-64.6/3.4)0.6
=(48-19)0.6
=290.6
=17.4
=(48-19)0.6
=290.6
=17.4
25×0.2×7.8×0.4用简便算法
15.5180-705×625×0.2×7.8×0.4用简便算法
= 8.4 X [ ( 3.6/3 + 10/3 ) / 1.7 - 1 ] / 2解答
25×0.2×7.8×0.4
=25×0.4×0.2×7.8
=10×0.2×7.8
=2×7.8
=15.6
25x0.4x0.2x7.8
=10x0.2x7.8
=2x7.8
=15.6
3.4ⅹ7x1.5的简便计算?
=1X7+4解:3.4×7×1.5
=10010.43=2×1.7×7×1.5
=21×1.7
=1.7(20+1)
=34+1.7
=35.7
3.4ⅹ7x1.5
=3.4ⅹ10.5
=1.721
=1.720+1.7
=34+1.7
3.4x7x1.5=3.4x0.5x7x3
=1.7x7x3
=11.9x3
3.4×7×1.5
=(4-0.6)×1.5×7
=(4×1.5-0.6×1.5)×7
=(6-0.9)×7
=5.1×7
3.4x7x1.5=3.4x0.5x7x3
=1.7x7x3
=11.9x3
3.4x2.5x1.8简便运算
19. 17/32 – 3/4 × 9/243.4x2.5x1.8简便运算:3.4x2.5x1.8=1.7x2x2.5x2x0.9=(1.7x0.9)x(2x2.5x2)=1.53x10=15.3。乘法,是指将相同的数加起来的快捷方式。其运算结果称为积,x是乘号。
从哲3.4×7×1.5用简便方法计算:(下面列出三种)学角度解析,乘法是加法的量变导致的质变结果。整数(包括负数),有理数(分数)和实数的乘法由这个基本定义的系统泛化来定义。
乘法也可以被视为计算排列在矩形(整数)中的对象或查找其边长度给定的矩形的区域,矩形的区域不取决于首先测量哪一侧,这说明了交换属性。
两种测量的产物是一种新型的测量,例如,将矩形的两边的长度相乘给出其面积,这是尺寸分析的主题。
整数的乘法运算满足:交换律,结合律,分配律,消去律。随着数学的发展,运算的对象从整数发展为更一般群。
12.5x7.3+1.25x7用简便的方法做出来
12.8.1.2517.6+36.1/0.8+2.3612.55x7.3+1.25x7=4300+86
=12.5x7.3+12.5x0.7
=12.5×(7.3+0.7)
=12.5×8
=100
几道奥数简便计算题,要过程,题目如下
方法1:( 1998 / 17 X 119 / 54 ) / ( 29 X 0.5 + 5.7 X 2 )
= [ ( 1998 X 119 ) / ( 17 X 54 ) ] / ( 14.5 + 11.4 )
= [ ( 222 X 9 X 17 X 7 ) / ( 17 X 9 X 6 ) ] / ( 4.9 + 21 )
= [ ( 222 X 7 ) / 6 ] / ( 7 X 3.7 )
= [ ( 111 X 7 ) / 3 ] / ( 7 X 3.7 )
= ( 37 X 7 ) / ( 7 X 3.7 )
= 10
[ (2+ 2/3) + Y ] / (3+ 3/4) - 0.4 = 32/45
( 8/3 + Y )( 4/15 ) = 32/45 + 18/45
32/45 + (4/15)Y = 32/45 + 18/45
( 4/15 )Y = 18/45
( 2/15 )(2Y) = ( 2/15 )( 9/3 )
2Y = 3
Y = 1.5
16.8 X [ (2.4+ 1/3) / 1.12 - (1+ 5/6) ]
= 8 X 2.1 X [ (7.2/3 + 1/3) / 1.12 - 11/6 ]
= 8 X 2,1 X ( 8.2 / 3 ) X 100/112 - 8 X 2,1 X 11/6
= 8 X 7 X 82 / (56 X 2) - 4 X 2.1 X 11 / 3
= 41 - 4 X 11 X 0.7
= 41 - 30.8
= 10.2
8.4 X [ (1.2 + 3+ 1/3 ) / 3.4 - 1/2 ]
= 4.2 X [ 13.6 / 5.1 - 5.1 / 5.1 ]
= 4.2 X 8.5 / 5.1
= 7
( 1+ 7/10 ) / [ (2+ 1/3) - 12/29 X ( 1.7 + 1+ 1/5 ) ] X 0.16
= 1.7 / [ 7/3 - 12/29 X ( 1.7 + 1.2 ) ] X 0.16
= 1.7 / [ 7/3 - 1.2/2.9 X 2.9 ] X 0.16
= 1.7 / [ 7/3 - 1.2 ] X 0.16
= 1.7 / [ 7/3 - 3.6/3 ] X 0.16
= 1.7 / ( 3.4 / 3 ) X 0.16
= 1.7 / 3.4 X 0.16 / 3
= 1/2 X 0.16 / 3
= 0.08 / 3
= 0.4 / 15
= 2 / 75
(1/2 + 1/3 + 1/4 +……+ 1/10) + (2/3 + 2/4 +=15900 2/5 +……+ 2/10) + (3/4 + 3/5 + 3/6 +……+ 3/10) +……+ (8/9 + 8/10) + 9/10
= 1/2 +(1+2)/3 +(1+2+3)/4 +(1+2+3+4)/5+……+(1+2+3+……+8)/9 +(1+2+3+4+……+9)/10
= 1/2 + 3/3 + 6/4 + 10/5 +……+ 36/9 + 45/10
= 0.5 + 1 + 1.5 + 2 + 2.5 + 3 + 3.5 + 4 + 4.5
= 0.5 X 5 + (1+2+3+4) X 2
= 2.5 + 20
= 22.5
原式=(1998/54x119/17)/(14.5+11.4)=(37x7)/25.9=259/25.9=10
原方程即: [(8/3)+□]/(15/4)-(2/5)=32/45
即 [(8/3)+□]/(15/4)=(32/45)+(2/5)=(32+18)/45=50/45=10/9
即 [(8/3)+□]=(10/9)(4/15)=8/27
所以 □=(8/27)-(8/3)=-64/27
4. 原式=8.4x[(6/5+10/3)/(17/5)-1/2]
=8.4x[4/3-1/2]
=8.4x5/6
=7
6. 原式=1/2+(1/3+2/3)+(1/4+2/4+3/4)+.....(1/10+2/10+....9/10)
=(1/2+1/3+1/4+...+1/10)+(2/3+2/4+2/5+...+2/10)+(3/4+3/5+3/6+...+3/10)+...(8/9+8/10) +9/10
3.题.5题很简单,通分吧 自己慢慢算咯
希望能帮助到你!
请大家帮我出数学题,10道脱式计算,10道简便运算,10道解比例(谢谢)
请大家帮我出数学题,10道脱式计算,10道简便运算,10道解比例(谢谢) 脱式计算
1、75÷〔138÷(100-54)〕
2、4/7÷[1/3×(3/5-3/10)]
3、(4/5+1/4)÷7/3+7/10
4、32.52-(6+9.728÷3.2)×2.5
5、 87(58+37)÷(64-9×5)
6、[(7.1-5.6)×0.9-1.15] ÷2.5
7、(3.2×1.5+2.5)÷1.6
8、 7 × 5/49 + 3/14
9、6 ×( 1/2 + 2/3 )
简算
1、24(1/2+5/8+1/6)
2、(7/10)/3+(3/10)/(1/3)
3、8 × 4/5 + 8 × 11/5
4、7/8 + ( 1/8 + 1/9 )
5、17/32 – 3/4 × 9/24
6、3 × 2/9 + 1/3
7、5/7 × 3/25 + 3/7
8、3/14 ×× 2/3 + 1/6
9、1/5 × 2/3 + 5/6
10、9/22 + 1/11 ÷ 1/2
解比例
3/5:x=1/3:2 x=3.6
3:8=15:x x=40
x:9=4:3 x=12
1/4:1/8=x:1/10 x=1/5
1.25:0.25=x:1.6 x=8
3/4:x=3:12 x=3
5:8=40:x x=64
x:3/4=1/5:2/5 x=3/8
140:2=x:5 x=350
6.5:x=3.25:4 x=8
求2道简便运算数学题谢谢
1,4 x 77+8x99=4x7x11+8x9x11=28x11+72x11=11x(28+72)=11x100=1100
2,666x333=666x3x111=999x111=(1000-1)x111=111000-111=110889
帮我出几道简便运算的题,谢谢了。
朋友,这里给你列出分数简便运算题,
1.3/7 × 49/9 - 4/3
2. 8/9 × 15/36 + 1/27
3. 12× 5/6 – 2/9 ×3
4. 8× 5/4 + 1/4
5. 6÷ 3/8 – 3/8 ÷6
6. 4/7 × 5/9 + 3/7 × 5/9
7. 5/2 -( 3/2 + 4/5 )
8. 7/8 + ( 1/8 + 1/9 )
9. 9 × 5/6 + 5/6
10. 3/4 × 8/9 - 1/3
11. 7 × 5/49 + 3/14
12. 6 ×( 1/2 + 2/3 )
13. 8 × 4/5 + 8 × 11/5
14. 31 × = 2.1 X 17 / ( 17 X 0.3 )5/6 – 5/6
15. 9/7 - ( 2/7 – 10/21 )
16. 5/9 × 18 – 14 × 2/7
17. 4/5 × 25/16 + 2/3 × 3/4
18. 14 × 8/7 – 5/6 × 12/15
20. 3 × 2/9 + 1/3
21. 5/7 × 3/25 + 3/7
22. 3/14 ×× 2/3 + 1/6
23. 1/5 × 2/3 + 5/6
24. 9/22 + 1/11 ÷ 1/2
25. 5/3 × 11/5 + 4/3
26. 45 × 2/3 + 1/3 × 15
27. 7/19 + 12/19 × 5/6
28. 1/4 + 3/4 ÷ 2/3
29. 8/7 × 21/16 + 1/2
30. 101 × 1/5 – 1/5 × 21
31.50+160÷40 (58+370)÷(64-45)
32.120-144÷18+35
33.347+45×2-4160÷52
34(58+37)÷(64-9×5)
35.95÷(64-45)
36.178-145÷5×6+42 420+580-64×21÷28
37.812-700÷(9+31×11) (136+64)×(65-345÷23)
38.85+14×(14+208÷26)
39.(284+16)×(512-8208÷18)
40.120-36×4÷18+35
41.(58+37)÷(64-9×5)
42.(6.8-6.8×0.55)÷8
谁帮我出10道简便计算奖
2.4÷20=
3.5×200=
4.1.5-0.06=
5.0.75÷15=
6.0.4×0.8=
7.4×0.25=
8.0.36+1.54=
9.1.01×99=
10.420÷35=
11.25×12=
12.135÷0.5=
14.2 + 4/9 =
15.3 - 2/3 =
16.3/4 - 1/2=
17.1/6 + 1/2 -1/6 =
18.7.5-(2.5+3.8)=
19.7/8 + 3/8 =
20.3/10 +1/5 =
21.4/5 - 7/10 =
22.2 - 1/6 -1/3 =
23.0.51÷17=
24.32.8+19=
25.5.2÷1.3=
26.1.6×0.4=
递等式计算
1. 3/7 × 49/9 - 4/3
2. 8/9 × 15/36 + 1/27
3. 12× 5/6 – 2/9 ×3
4. 8× 5/4 + 1/4
5. 6÷ 3/8 – 3/8 ÷6
6. 4/7 × 5/9 + 3/7 × 5/9
7. 5/2 -( 3/2 + 4/5 )
8. 7/8 + ( 1/8 + 1/9 )
9. 9 × 5/6 + 5/6
10. 3/4 × 8/9 - 1/3
11. 7 × 5/49 + 3/14
12. 6 ×( 1/2 + 2/3 )
13. 8 × 4/5 + 8 × 11/5
14. 31 × 5/6 – 5/6
15. 9/7 - ( 2/7 – 10/21 )
16. 5/9 × 18 – 14 × 2/7
17. 4/5 × 25/16 + 2/3 × 3/4
18. 14 × 8/7 – 5/6 × 12/15
20. 3 × 2/9 + 1/3
21. 5/7 × 3/25 + 3/7
22. 3/14 ×× 2/3 + 1/6
23. 1/5 × 2/3 + 5/6
24. 9/22 + 1/11 ÷ 1/2
25. 5/3 × 11/5 + 4/3
26. 45 × 2/3 + 1/3 × 15
27. 7/19 + 12/19 × 5/6
28. 1/4 + 3/4 ÷ 2/3
29. 8/7 × 21/16 + 1/2
30. 101 × 1/5 – 1/5 × 21
31.50+160÷40 (58+370)÷(64-45)
32.120-144÷18+35
33.347+45×2-4160÷52
34(58+37)÷(64-9×5)
35.95÷(64-45)
36.178-145÷5×6+42 420+580-64×21÷28
37.812-700÷(9+31×11) (136+64)×(65-345÷23)
38.85+14×(14+208÷26)
39.(284+16)×(512-8208÷18)
40.120-36×4÷18+35
41.(58+37)÷(64-9×5)
42.(6.8-6.8×0.55)÷8.5
43.0.12× 4.8÷0.12×4.8
44.(3.2×1.5+2.5)÷1.6 (2)3.2×(1.5+2.5)÷1.6
45.6-1.6÷4= 5.38+7.85-5.37=
46.7.2÷0.8-1.2×5= 6-1.19×3-0.43=
47.6.5×(4.8-1.2×4)= 0.68×1.9+0.32×1.9
48.10.15-10.75×0.4-5.7
49.5.8×(3.87-0.13)+4.2×3.74
50.32.52-(6+9.728÷3.2)×2.5
51.2÷2.5+2.5÷2
52.194-64.8÷1.8×0.9
53.36.72÷4.25×9.9
54.5180-705×6
55.24÷2.4-2.5×0.8
56.(4121+2389)÷7
57.671×15-974
58.469×12+1492
59.405×(3213-3189)
60.3.416÷(0.016×35)
61.0.8×[(10-6.76)÷1.2]
62.19.4×6.1×2.3 5.67×0.2-0.62
63.18.1×0.92+3.93 0.0430.24+0.875
64.0.4×0.7×0.25 0.75×102 100-56.23
65.0.78+5.436+1 4.07×0.86+9.12.5
简便运算
1. 1-2+3-4+5-6+7-8+9-10+11-12+................+2003-2004+2005-2006+2007
=1+(3-2)+(5-4)+.........+(2007-2006)
=1+(2007-1)/2
=1005
2、480+325+75
=480+(325+75)
=480+400
=880
3、295-128-72
=295+(128+72)
=295+200
=495
4、43×25×4
=43×(25×4)
=43×100
=4300
=(100+2)×43
=100×43+2×43
=4386
6、9×37+9×63
=9×(63+37)
=9×100
=900
7.66×38-987÷21 66×38-987÷21
=8-987÷21 =8-47
=8-47 =2461
=2461
1.2517.6+36.1/0.8+2.3612.5
=(5/4)17.6+36.1(5/4)+23.6(50/4)
=176/8+361/8+236/8
=773/8=96.625
9.7.52.3+1.92.5
7.52.3+1.92.5
=7.5(1.9+0.4)+1.92.5
=(7.5+2.5)1.9+7.50.4
=19+3 =22
10.2004/20032005
2004/20032005
=(2004/2003)(2003+2)
=2004+4008/2003
11.276543-267/276+543275
276543-267/276+543275
=543(276+275)-267/276
=543551-267/276
12.2002+2001-2000-1999+1998+1997-1996-1995+……+2+1
=(2002-2000)+(2001-1999)+(1998-1996)+(1997-1995)+……+(6-4)+(5-3)+2+1
=2+2+2+2+……+2+2(从3-2002共2000个数,所以有1000个2)+2+1
=1000×2+2+1
=2003
=1/(1×3)+1/(3×5)+1/(5×7)+1/(7×9)+1/(9×11)
=1/2×(1-1/3)+1/2×(1/3-1/5)+1/2×(1/5-1/7)+1/2×(1/7-1/9)+1/2×(1/9-1/11)
=1/2×(1 - 1/3 + 1/3 - 1/5 + 1/5 - 1/7 + 1/7 - 1/9 + 1/9 - 1/11)
=1/2×(1-1/11)
=1/2×10/11
=5/11
14.0.49÷1.4 1.25×2.5×32 3.6-0.6×2
16.5.6÷3.5 9.6÷0.8÷0.4 4.2×99+4.2
17.0.89×100.1 146.5-(23+46.5) 17.8÷(1.78×4)
18.5.83×2+4.27 (45.9-32.7)÷8÷0.125 9.7×99+9.7
19.4.36×12.5×8 15.6×13.1-15.6-15.6×2.1 0.65×101
20.27.5×3.7-7.5×3.7 8.54÷2.5÷0.4 3.83×4.56+3.83×5.44
21.9.9×0.625×101-62.5
22.9.9×8.6+0.86
23.0. 46×7.5+0. 46×2. 5
24.4.6×8.04+6.4×8.04-8.04
25.5.4×0.15÷0.2+4.6×0.15
=270.15+4.60.15
=(27+4.6)0.15
=31.60.15
=4.74
26.55×10.43+104.3×4.4+104.3×0.1
=55×10.43+10.43×44+10.43×1
=(55+44+1)10.43
=1043
解方程
1.5/17-x=1/5
2=56.5/9+x=23
3.6x-x=0.5
4.x-4/9=2/3
5.4x+20=3.9
7.17+8.3 4x=50-12
8.4x=38
9.2.3x-1.02=0.36
10.24 x=0.6
11.X-5.7=2.15
12.15 5X-2X=18
13.3X+0.7=5
14.3.5×2= 4.2+x
15.26×1.5= 2x+10
16.0.5×16―16×0.2=4x
17.13 9.25-X=0.403
18.16.9÷X=0. 3
19.X÷0.5=2.6
20.x+13=33
21.3 - 5x=80
22.1.8 +6x=54
23.6.7x -60.3=6.7
24.9 +4x =40
25.0.2x-0.4+0.5=3.7
26.9.4x-0.4x=16.2
口算(补充):
17×40=680, 100-63=37, 3.2+1.68=4.88, 2.8×0.4= 1.12
14-7.4=6.6, 1.92÷0.04=48, 0.32×500=160, 0.65+4.35= 5
10-5.4=4.6, 4÷20=0.2, 3.5×200=700, 1.5-0.06=1.44
0.75÷15=0.05, 0.4×0.8=0.32, 4×0.25=1, 0.36+1.54=2
1.01×99=99.99, 420÷35=12, 25×12=300, 135÷0.5=270
3/4 + 1/4 =1, 2 + 4/9 =22/9, 3 - 2/3 =7/3, 3/4 - 1/2= 1/4
1/6 + 1/2 -1/6 =1/2, 7.5-(2.5+3.8)=1.2, 7/8 + 3/8 =5/4
3/10 +1/5 =1/2, 4/5 - 7/10 =1/10, 2 - 1/6 -1/3 =1.5
0.51÷17=0.03, 32.8+19=51.8, 5.2÷1.3=4, 1.6×0.4= 0.64
4.9×0.7=3.43, 1÷5=0.2, 6÷12=0.5, 0.87-0.49=0.38
还有:
1.(1+1/2)(1+1/3)(1+1/4)......(1+1/100)
2.(1-1/2)(1-1/3)(1-1/4)......(1-1/100)
3.8+2-8+2
4.254/254
5.7.26-(5.26-1.5)
6.286+198
7.314-202
8.526+301
9.223-99
10.6.25+3.85-2.125+3.875
11.9-245621
12.0.5/11.5-42.75
13.1/2×3/5
14.3.375+5.75+2.25+6.625
15.1001-9036÷18
16.3.8×5.25+14.5
17.2.14.3+5.72.1
18.30×1/3
19.10245-328
20.2/3×12
21.2.83.1+17.6/8
22.3/5×5/6
23.(50-12.5)/2.5
24.2/5×1/3
25.611047+639
26.1/2-1/6
27.3.52.7-52.2/18
28.1/7×1/5
29.3.3750.97+0.976.625
30.25×4/5
31.6.54+2.4+3.46+0.6
32.5/6-1/2
33.95.61.8+95.68.2
34.1/2×1/5
35.600-420/12
36.344/3.6-5.40.25
37.16/2+30/2+90/6
38.3001-1998.
39.5000-10534
40.0.15/0.25+0.751.2
41.(1/2+1/3+1/4)0.24
42.(25+4)4
43.300-4263/21
44.0.81/0.25+5.96
45.403÷13×27
46.1.5×4.2-0.75÷0.25
47.3.27×4 +3.27×5.7
48.(1.2+ 1.8)×4.51025-768÷32
49.0.25×80-0.45÷0.9
50.1025-768÷32
52.2348+27516
53.2/915/8-1/129/5
54.2.4+2.4(5.375-3.375)
55.645-4512
56.0.15+1.2/0.24-0.45
57.3.75-(2.35+0.25/1.25)
58.761/4+2325/100+0.25
59.10-2.87-7.13
60.0.96+9.69.9
61.7.5-5.71/3
62.12.37-3.25-6.75
63.166.8+2.216+16
64.40119+284
65.58.7-16.65/3.7
66.0.44.72.5+(2.3+5.3)
67.9.31-1.125-7.875
68.640+12845
69.8.21.6-0.336/4.2
70.400(0.62+0.08)
1.5×3.6=( ) 3.7×5.3=( ) 2.3×6=( )
8.1×3.4=( ) 7.6×4.3=( ) 1.6×5.3=( )
4.3×7-6.3+5.1=( ) 6.2÷3.1×4.5=( )
(8.6-1.5+9.4)×9.3=( )(5.3+2.7)÷(3.6+2.5)=( )
4.56=?
6-4.05=?
8.4÷0.7=?
0.51.2=?
0.55÷1.1=?
5.42+7.51.6=?
0.251.70.4=?
7.86-4015-2.85=?
0.125322.5=?
4.56=?
6-4.05=?
8.4÷0.7=?
0.51.2=?
0.55÷1.1=?
5.42+7.51.6=?
0.251.70.4=?
7.86-4015-2.85=?
0.125322.5=?
4.56=?
6-4.05=?
8.4÷0.7=?
0.51.2=?
0.55÷1.1=?
5.42+7.51.6=?
0.251.70.4=?
7.86-4015-2.85=?
0.125322.5=?
求150到简便运算,或者是解比例的计算题,谢谢^_^
小学六年级数学总复习资料(六) 【简便计算】
班级: 姓名:
一、口算下面各题。(23分)
10-2.65= 0.9×0.08= 528-349= 6+14.4= 24÷0.04=
12.34-2.3= 0÷3.8= 0.77+0.33= 7÷1.4= 67.5+0.25=7.2÷8×4= 5-1.4-1.6= 400÷125÷8= 1.9×4×0.5=
80×0.125= 3× = 6 6= 2 -( + )= 10 2=
3.2×7÷3.2×7= ( - )×12= 187.7×11-187.7= 1- 62.5%=
二、写出下列每题在简便运算时所运用的定律或性质(12分)
4 +3.2+5 +6.8 25×(8×0.4)×1.25 7 -(2 - )
( ) ( ) ( )
( + + )×72 93.5÷3 16÷2.5
( ) ( ) ( )
三、用简便方法计算。(65分)
1125-997 998+1246+9989 (8700+870+87)÷87
125×8.8 1.3+4.25+3.7+3.75 17.15-(3.5-2.85)
3.4×99+3.4 4.8×1.01 0.4×(2.5÷73)
(1.6+1.6+1.6+1.6)×25 ( + - )÷
64.2×87+0.642×1300 78×36+7.8×741-7 17+ 8
0.125× +0.5 2.42 +4.58 -43
25÷100 4.25-3 -(2 -1 )
(1)1.2517.6+36.1/0.8+2.3612.5
1.2517.6+36.1/0.8+2.3612.5
=(5/4)17.6+36.1(5/4)+23.6(50/4)
=176/8+361/8+236/8
=773/8=96.625
(2)7.52.3+1.92.5
7.52.3+1.92.5
=7.5(1.9+0.4)+1.92.5
=(7.5+2.5)1.9+7.50.4
=19+3 =22
(3)2004/20032005
2004/20032005
=(2004/2003)(2003+2)
=2004+4008/2003
(4)276543-267/276+543275
276543-267/276+543275
=543(276+275)-267/276
=543551-267/276
(5)17/51+ (68/1+51/2)17
17/51+ (68/1+51/2)17
后面的做不下去了,好像有一些没有简便方法,不知道你题目有没有抄错,你的68/1中的68是分子还是分母呀?应该是分母都对
(6)(3.25-0.88/5)/(6又4/1-3.5)
是6又1分之4吗?应该是6又4分之1吧
1)五十二又二十五分之十一×79.45+159×47.56+七十九又二十分之十一×52.44
=52.44×79.45+159×47.56+79.55×52.44
=52.44×(79.45+79.55)+159×47.56
=52.44×159+159×47.56
=159×100
3)2002+2001-2000-1999+1998+1997-1996-1995+……+2+1
=(2002-2000)+(2001-1999)+(1998-1996)+(1997-1995)+……+(6-4)+(5-3)+2+1
=2+2+2+2+……+2+2(从3-2002共2000个数,所以有1000个2)+2+1
=1000×2+2+1
=2003
4,5两题均用到一个转换式1/(A×B)=1/(B-A)×(1/A-1/B)
如1/15=1/(3×5)=1/(5-3)×(1/3-1/5)=1/2×(2/15)=1/15可验证一下
4)(1×2分之一)+(2×3分之一)+(3×4分之一)+……+(10×11分之一)
=(1-1/2)+(1/2 - 1/3)+(1/3 - 1/4)+……+(1/10 - 1/11)
=1-1/11
=10/11
5)三分之一+十五分之一+三十五分之一+六十三分之一+九十九分之一
=1/(1×3)+1/(3×5)+1/(5×7)+1/(7×9)+1/(9×11)
=1/2×(1-1/3)+1/2×(1/3-1/5)+1/2×(1/5-1/7)+1/2×(1/7-1/9)+1/2×(1/9-1/11)
=1/2×(1 - 1/3 + 1/3 - 1/5 + 1/5 - 1/7 + 1/7 - 1/9 + 1/9 - 1/11)
=1/2×(1-1/11)
=1/2×10/11
=5/11
6)一又二分之一-六分之五+十二分之七-二十分之九+三十分之十一-四十二分之十三+五十六分之十五
(根据提示,1又1/2=1+1/2,+1/2+1/3=5/6……)
=(1+1/2)-(1/2+1/3)+(1/3+1/4)-(1/4+1/5)+(1/5+1/6)-(1/6+1/7)+(1/7+1/8)
=1+ 1/2 - 1/2 - 1/3 + 1/3 + 1/4 - 1/4 - 1/5 + 1/5 + 1/6 - 1/6 - 1/7 + 1/7 + 1/8
=1+1/8
=9/8
自编10道分数除法计算题(其中5道简便运算)
百度查:口算题自动生成的小程序 包你满意
酒仙狂,希望对你有用
简便运算,数学题,谢谢!
85858585×99999999÷1010101÷11111111
=85858585÷1010101×99999999÷11111111
=85×9
=85×(10-1)
=850-85
=765
请大家帮我算一道简便计算题(要步骤): 7.69×[1÷(3又1/10 -3.09)]
=7.69×[1÷(310/100-309/100]
=7.69×(1÷1/100)
=7.69×100
=769
谁能帮我出52道简便运算(不含分数)题?
1.30.8÷[14-(9.85+1.07)]
2.[60-(9.5+28.9)]÷0.18
3.2.881÷0.43-0.24×3.5
4.20×[(2.44-1.8)÷0.4+0.15]
5.28-(3.4+1.25×2.4)
6.2.55×7.1+2.45×7.1
7.777×9+1111×3
8.0.8×[15.5-(3.21+5.79)]
9.(31.8+3.2×4)÷5
10.31.5×4÷(6+3)
11.0.64×25×7.8+2.2
12 2÷2.5+2.5÷2
13.194-64.8÷1.8×0.9
14.36.72÷4.25×9.9
16.24÷2.4-2.5×0.8
17.(4121+2389)÷7
18.671×15-974
19.0.8×[7.9-(2+5)]
20.469×12+1492
21.405×(3213-3189)
22.3.416÷(0.016×35)
23.0.8×[(10-6.76)÷1.2]
24.10x1.3
25.0.32x100
26.24+0.24
27.3.2x0.6
28.15-0.15
29.1.9x0.02
30.0.4x0.5
31.1.25x8
32.2.5x4
33.0.24x4
34.200x0.16
35.49×102-2×49
36.125×78×8
37.8.33-2.43-4.57
38.99×37
39.6.7-2.63+3.3-3.37
41.216+305 25×32 47+236+64
42.6×(15×9) 402+359 43+78+122+257
43.25×(26×4) 25×44 354+(229+46)
44.9.26-4.38-2.62
45.9.26-(4.38+2.26)
46.9.26-(4.38-2.74)
47.125×560
48.45×71+29×45
49.13.6×8×125
50.13.6-4.25-5.75+6.4
51.18.3-6.25-3.75+12.7
52.64×101
希望能采纳!
小学数学题一道简便运算
16-60.54+1.663.6+1.66=16-60.54+1.66(3.6+1)=16-3.24+7.636=20.396
3.4×7×1.5的简便计算怎么算?
3.4×7×1.5
=1.7×2×7×1.5
=2×1.5×1.7×7(这里用乘法交换律)
=5.1×7
3.4×7×1.5
=(21+2.8)×1.5
=23.8×1.5
=23.8+11.9
=35.7
原式:3.4×7×1.5
=2×1.7×7×1.5
=(2×1.5)×1.7×7
=5.1×7
望采纳!
三点4×7×1点五可以算三点4×5括号。然后乘7×0点三就可以进行计算三点4×7×1点五可以算三点4×5括号,然后乘7×0点三就可以进行计算
3.4×7x1.5
=3.4×10.5
=1.721
=1.720+1.7
本题的简便计算方法如下:3.4×7×1.5=3.4×10.5=3.4×(10+0.5)=3.4×10+3.4×0.5=34+1.7=35.7
3.4×7×1.5
=(21+2.8)×1.5
=23.8×1.5
=23.8+11.9
=35.7
直接相乘。
这就是最简便方法:
3.471.5=35.7=(3×7+0.4×7)×1.5,
3.4ⅹ7ⅹ1.5
==3×1.7×73.4x(1+0.5)x7
=(3.4ⅹ1+3.4x0.5)x7
=(3.4+1.7)ⅹ7
=5.1Ⅹ7
3.4x-48=26.8,求x=多少?
3.4x-48=26.8
解:3.4x-48+48=26.8+48
3.4X=74.8
x=2213.1/3+1/15++1/35+1/63+九十1/9
一元一次方程的一般解法:
1、去分母:方程两边同时乘各分母的最小公倍数。
2、去括号:一般先去小括号,再去中括号,去大括号。但顺序有时可依据情况而定使计算简便。可根据乘法分配律。
3、移项:把方程中含有未知数的项移到方程的另一边,其余各项移到方程的另一边移项时别忘记了要变号。(一般都是这样:(比方)从5x=4x+8得到5x - 4x=8;把未知数移到一起!
4、合并同类项:将原=23.8+23.8×0.5方程化为ax=b(a≠0)的形式。
5、化系数为一方程两边同时除以未知数的系数。
6、得出方程的解。
四年级数学课堂练习本 2.5x2.8+4 = = 用简便方法计算
题目貌似应该是2.52.84=(2.54)2.8=102.8=10、8 × 4/5 + 8 × 11/528
2.5x2.8+4=2.5x(2+0.8)+4=2.5x2+5、102×432.5x0.8+4=5+2+4=11
2.5x(2+0.8)+4=5+2+4=11
2.5X2.8+4
=2.5X(0.4X7)+4
=(2.5X0.4)X7+4
=7+4
=11
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