25*6.4*12.5 2/3-1/6= 3/4+1/8= 6/7+7/9-6/7+7/9

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25*6.4*12.5 2/3-1/6= 3/4+1/8= 6/7+7/9-6/7+7/9

25*6.4*12.5
=25*0.4*2*0.8*12.5
=10*2*10
=200.

2/3-1/6=4/6-1/6=3/6=1/2.

3/4+1/8= 6/8+1/8=7/8.

6/7+7/9-6/7+7/9=14/9.

①36×2/7×5/72×43②(7/8+7/16)÷7/16③6/7×3/4+1/4×6/7

1、原式=2/7×5/2×43=5/7×43=215/7
2、原式=(7/8)/(7/16)+1=2+1=3
3、原式=6/7×(3/4+1/4)=6/7

25*6.4*12.5 (3-1/4-5/12)÷2/3 3.25*5.8+67.5*0.58 5/7÷(7-6*2/3)

25*6.4*12.5
=(25x4x4)x(0.8x12.5)
=400x10
=4000
(3-1/4-5/12)÷2/3
=3x3/2-1/4x3/2-5/12x3/2
=9/2-3/8-5/8
=9/2-1
=7/2
3.25*5.8+67.5*0.58
=(3.25+6.75)x5.8
=10x5.8
=58
5/7÷(7-6*2/3)
=5/7÷(7-4)
=5/7÷3
=5/21
请好评

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7分之5*11分之6*7/10 3/4*(9/10-5/6) (1/5+1/9)*45 23/25*1/4+1/4*2/25 101*3/10-3/10

你好:

7分之5*11分之6*7/10
=5/7×6/11×7/10
=3/11

3/4*(9/10-5/6)
=3/4×1/15
=1/20

(1/5+1/9)*45
=1/5×45+1/9×45
=9+5
=14

23/25*1/4+1/4*2/25
=1/4×(23/25+2/25)
=1/4×1
=1/4

101*3/10-3/10
=3/10×(101-1)
=3/10×100
=30

1/4+3/7+7/9=?

10/7

简便运算2/3+3/4+4/5+6/7+7/8+8/9+9/20+10/21+17/72

2\3+3\4+4\5+6\7+7\8+8\9+1\4+1\5+1\3+1\7+1\8+1\9=6

1+(2-1/2)+(3-1+1/3)+(4-3/2+2/3-1/4)+……+(9-8/2+7/3-6/4+……+3/7-2/8+1/9)

1+(2-1/2)+(3-1+1/3)+(4-3/2+2/3-1/4)+……+(9-8/2+7/3-6/4+5/5 -4/6+3/7-2/8+1/9) =(1+2+...+9)-(1/2 +2/2 +...+8/2) +(1/3 +2/3+3/3+...+7/3)-(1/4 +2/4 +...+6/4)+(1/5 +2/5+...+5/5) -(1/6 +2/6+3/6+4/6)+(1/7+2/7+3/7)-(1/8+2/8)+1/9 =(1+2+...+9)-(1+2+...+8)/2 +(1+2+...+7)/3 -....+(1+2+3)/7 -(1+2)/8 +1/9 =45 -18+ 28/3 -21/4 +3- 5/3 +6/7 -3/8 +1/9 =30 +23/3 -45/8 +6/7 +1/9 =30+7-5+7/9 +6/7 -5/8

7/12×24/37=? 7/39×13/39=? 2/47×10=? 1/17×3/5=? 61/70×6/32=? 9/8×6/7=?

14/37 7/117 20/47 3/85 61/1120 27/28
63/144 49/71 1/248 6/355 4/110

12÷4/5+6/7×1/3 4/7×3/10÷(1/5-1/7)(1/18+1/3-1/6)÷1/9 (0.875-5/16)×(10/9+2/3)

1题:12÷4/5+6/7×1/3
=12×5/4+6/7×1/3
=15+2/7
=15又2/7
2题:4/7×3/10÷(1/5-1/7)
=4/7×3/10÷(7/35-5/35)
=4/7×3/10÷2/35
=4/7×3/10×35/2
=3
3题:(1/18+1/3-1/6)÷1/9
=(1/18+6/18-3/18)×9
=(2/9)×9
=2
4题:(0.875-5/16)×(10/9+2/3)
=(7/8-5/16)×(10/9+6/9)
=(14/16-5/16)×16/9
=9/16×16/9
=1

(-385)^ -9 *(-1/8)^-8*(-4/5)^-9*(1/9)^8*(-3/7)^-9*(-6/11)^-9

(-385)^ -9 *(-1/8)^-8*(-4/5)^-9*(1/9)^8*(-3/7)^-9*(-6/11)^-9
=(-11*35)^-9*(1/8)^-8*[-(4/5)^-9]*1/9^8*[-(3/7)^-9*[-(6/11)^-9]
=(11*35)^-9*(1/8)^-8*(4/5)^-9*1/9^8*(3/7)^-9*(6/11)^-9
=(11*35*4/5*3/7*6/11)^-9*(1/8*1/9)^-8
=72^-9*(1/72)^-8
=72^-9*72^8
=72^(-9+8)
=72^-1
=1/72

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