X/50+2=X/40怎么解?

问题描述:

X/50+2=X/40怎么解?

等于400,先通分和并x,在得出答案

X/50+2=X/40
X/40-X/50=2
5X/200-4X/200=2
(5/200-4/200)X=2
X/200=2
X=400

x=400
解法:
x/50-x/40=-2
(40x-50x)/2000=-2
-10x/2000=-2
-x/200=-2
x=400

两边同时乘200
4x+400=5x
x=400