能简算的要简算 (3/4-3/5)÷7/10 (2/3+2/9)÷20/21 1-5/14能简算的要简算(3/4-3/5)÷7/10(2/3+2/9)÷20/211-5/14÷5/71/4÷(2/3+1/2)×4/5

问题描述:

能简算的要简算 (3/4-3/5)÷7/10 (2/3+2/9)÷20/21 1-5/14
能简算的要简算
(3/4-3/5)÷7/10
(2/3+2/9)÷20/21
1-5/14÷5/7
1/4÷(2/3+1/2)×4/5