(2x/3 - 10)/(x/3+10)= 7/5(怎么解)
问题描述:
(2x/3 - 10)/(x/3+10)= 7/5(怎么解)
答
5(2x/3 - 10)=7(x/3+10)
10x/3 - 50=7x/3+70
10x/3 - 7x/3=50+70
x=120