简便运算.能简便的要简便.五小题.如下.
问题描述：
简便运算.能简便的要简便.五小题.如下.
3/5×(5/12÷3/4) 5/6+7/12÷1/2 2/3÷[1-(1/3-1/4)] 4÷1.25÷8 5/9×7/13+6/13×5/9
答
3/5×(5/12÷3/4) =(3/5)×(5/12 × 4/3)=(3/5)×(5/9)=1/3.5/6+7/12÷1/2=5/6+(7/12)×2=5/6 + 7/6=12/6=2.2/3÷[1-(1/3-1/4)] =(2/3)÷( 1- 1/12)=(2/3)÷(11/12)=(2/3)×(12/11)=8/11.4÷1.25÷8 =4÷(1.25×8)=4...