简便运算 8分之5成4分之3加4分之1乘分之5加8分之5

问题描述:

简便运算 8分之5成4分之3加4分之1乘分之5加8分之5

5/8*3/4+1/4*5/8+5/8
=5/8*(3/4+1/4+1)
=5/8*2
=5/4

5/8×3/4+1/4×5/8+5/8
=5/8×(3/4+1/4+1)
=5/8×2
=5/4
=1又1/4