(x+5)+(x-5)+2x-2x=270怎么解?
问题描述:
(x+5)+(x-5)+2x-2x=270怎么解?
答
解
(x+5)+(x-5)+2x-2x=270
x+5+x-5+2x-2x=270
2x=270
x=270÷2=135