(x/2-40)/(x/2+40)=2/3 怎么解
问题描述:
(x/2-40)/(x/2+40)=2/3 怎么解
答
令 x/2 = m,即 x = 2m
原式即 (m-40) / (m+40) = 2/3
等号两边同乘3(m+40),得 3m-120 = 2m+80,
解得m = 200,x = 2m = 400