Question

7分之1乘12分之5加12分之5除5分之7 简便算法怎么算

Answer 1

7分之1乘12分之5加12分之5除5分之7
=1/7*5/12+5/12/(7/5)
=5/12*(1/7+5/7)
=5/12*6/7
=5/14