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7/8×6/7×4/9竖式计算

7/8×6/7×4/9 =6/8X4/9 =3/4X4/9 =1/3

如图

5/9×7/8+4/9÷(8/7)简算 =5/9x7/8+4/9x7/8 =(5/9+4/9)x7/8 =1x7/8 =7/8

利用乘法分配率

9又7/8x8+8又6/7x7+7又5/6x6+6又4/5x5 =(9+7/8)x8+(8+6/7)x7+(7+5/6)x6+(6+4/5)x5 =72+7+56+6+42+5+30+4 =200+22 =222

(28/36-15/36)X36 =13/36X36 =13

(8/9+10/7+6/11)÷(3/11+4/9+5/7) =2×(3/11+4/9+5/7)(3/11+4/9+5/7) =2

(7*8*9*10*11+3*4*5*6*7)/(7*8*9*10*11) =1+(3*4*5*6*7)/(7*8*9*10*11) =1+(3*4*5*6)/(8*9*10*11) =1+6/(2*3*2*11) =1+1/(2*11) =1+1/22 =23/22

1. 1/8*14/8/7 =7/4/8/7 =7/4*7/8 =49/*32 2. 9/14/(6/5-3/4)*7/24 =9/14/9/20*7/24 =9/14*20/9*7/24 =20/14*7/24 =5/12 第三小题题目再发准确点行吗

7/8×0.375+3/8÷8/9 =7/8×3/8+3/8×9/8 =(7/8+9/8)×3/8 =2×3/8 =3/4

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