(4X-10):(X+10)=2:1怎么解?详细点
问题描述:
(4X-10):(X+10)=2:1怎么解?详细点
答
( 4X-10):(X+10)=2:1
2(x+10)=(4x-10)
2x+20=4x-10
4x-2x=20+10
2x=30
x=30÷2
x=15