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副号1-1/4×8/9括号除以7/9脱式计算

(-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

1-7/9÷7/8 =1-7/9x8/7 =1-8/9 =1/9

括号4/9加5/6减7/18括号除以1/36怎么简便计算? 括号4/9加5/6减7/18括号除以1/36 =36*4/9+36*5/6-36*7/18 =16+30-14 =32

16分之7×括号开4/7-9分之1括号闭÷18分之1 =(7/16)X(4/7-1/9)X18 =(7/16)X(4/7)X18-(7/16)X(1/9)X18 =9/2-7/8 =36/8-7/8 =29/8 =8分之29

4/9×[3/4-(7/16-1/4)] =16/(9×4)×[3/4-(7/16-1/4)] =[3*4-(7-4)]/36 =(12-3)/36 =9/36 =1/4

80/72

8/9×[3/4-(7/16-1/4)] =8/9×(3/4-7/16+1/4)←看到分母相同的,拆括号先算分母相同的 =8/9×(3/4+1/4-7/16) =8/9×(1-7/16) =8/9×9/16←分子分母约分 =1/2

原式=1×2×3/2×4/3×5/4×6/5×7/6×8/7×9/8×10/9 =10

如图所示

(7/9+5/6-1/4)×72 =7/9×72+5/6×72-1/4×72 =56+60-18 =98

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