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八除以1+7括号括回列脱式计算怎么做

2/5×[1/5+8/21÷(4/7)] =2/5x(1/5+2/3) =2/5x(13/15) =26/75

7/8-括号5/12+1/6括回脱式计算 (7/8)-(5/12+1/6) =(7/8)-(7/12) =(21/24)-(14/24) =7/24.

80/72

24×(1/4+5/6-7/8) =6+20-21 =5

(-1-1/4×8/9)÷7/9 =(-1×9/7)-(1/4×9/7)×(8/9×9/7) =-9/7-9/28×8/7 =-36/28-9/28×8/7 =-36/28-36/98 =-63/49-18/49 =-81/49

先通分再相减

80-154÷7 =80-22 =58

2/7÷(3/5+1/3) =2/7÷(9/15+5/15) =2/7÷(14/15) =2/7×15/14 =15/49

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

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