(x-10)+(x+20)+ x/2 +2x=370
问题描述:
(x-10)+(x+20)+ x/2 +2x=370
答
(x-10)+(x+20)+x/2+2x=370
2x+10+x/2+2x=370
4x+x/2=360
8x+x=720
x=80
答
(x-10)+(x+20)+ x/2 +2x
=x-10+x+20+x/2+2x
=4x+x/2+10
=9x/2+10=370
9x/2=360
x=360*2/9=80