①(4\5-7\15)÷3\10

问题描述:

①(4\5-7\15)÷3\10

①(4\5-7\15)÷3\10
= (4\5-7\15)x 10/3
= (12/15-7/15)x 10/3
= 1/3 x 10/3
= 10/9