(6/7-3/5)除以9/5简便运算

(6/7-3/5)除以9/5简便运算
(6/7-3/5)除以9/5简便运算

(6/7-3/5)除以9/5简便运算
（6/7-3/5）除以9/5
=（6/7-3/5）*5/9
=6/7*5/9-3/5*5/9
=10/21-1/3
=10/21-7/21
=3/21
=1/7

21/35*5/9=1/3

(6/7-3/5)除以9/5=（6/7）/(9/5)-(3/5)/(9/5)=(2/7)(5/3)-1/3=(1/3)(10/7-1)=1/7

(6/7-3/5)÷9/5
=(6/7-3/5)×5/9
=10/21-1/3
=3/21
=1/7



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