[3-2x/1-x]-1=[x+2/x-3]怎么做
问题描述:
[3-2x/1-x]-1=[x+2/x-3]怎么做
答
(3-2x)/(1-x)-(1-x)/(1-x)=(x+2)/(x-3)
得(2-x)/(1-x)=(x+2)/(x-3)
得(2-x)(x-3)=(1-x)(x+2)
得5x-6=2-x
得6x=8
得x=4/3
答
先通分,再分类讨论,分母不为零
答
这个式子有问题啊
应该是(3-2x)/(1-x)-1=(x+2)/(x-3)
先通分[(3-2x)-(1-x)]/(1-x)=(x+2)/(x-3)
化简(2-x)/(1-x)=(x+2)/(x-3)
即(2-x)*(x-3)=(x+2)*(1-x)
x=4/3