18/25*x=2/9 7/8x*5/7=7/15

问题描述:

18/25*x=2/9 7/8x*5/7=7/15
*是乘

18/25*x=2/9
x=2/9 * 25/18
x=25/81
7/8x*5/7=7/15
x* 5/8=7/15
x=7/15 * 8/5
x=56/75