7/15- ()/3=2/15 ()/8-1/10=1/40

问题描述:

7/15- ()/3=2/15 ()/8-1/10=1/40
7/15- ()/3=2/15 ()/8-1/10=1/40
5/()+5/9=5/6

1/3
1/8
5/18