25除[5/12+5/9]的简便运算

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25除[5/12+5/9]的简便运算25除[5/12+5/9]的简便运算25除[5/12+5/9]的简便运算25/(5/12+5/9)=5/(1/12+1/9)=5/[(12+9)/(12*9)]=5

25除[5/12+5/9]的简便运算
25除[5/12+5/9]的简便运算

25除[5/12+5/9]的简便运算
25/(5/12+5/9)
=5/(1/12+1/9)
=5/[(12+9)/(12*9)]
=5/(7/36)
=180/7

25÷[5/12+5/9]
=25×12/5+25×9/5
=60+45
=105