[17/15-(5/8—1/6+7/12)×24]÷(-5) 3/2×5/7-(-5/7)×5/2+(-1/2)÷7/5

问题描述:

[17/15-(5/8—1/6+7/12)×24]÷(-5) 3/2×5/7-(-5/7)×5/2+(-1/2)÷7/5

[17/15-(5/8—1/6+7/12)×24]÷(-5) =[17/15-(5/8×24—1/6×24+7/12×24)]÷(-5)=[17/15-(15-4+14)]÷(-5)=[17/15-25]÷(-5)=-17/15×1/5+25×1/5=-17/75+5=4又58/753/2×5/7-(-5/7)×5/2+(-1/2)÷7...