4(3x+1)²-9=0 x=?
问题描述:
4(3x+1)²-9=0 x=?
答
4(3x+1)²-9=0
(3x+1)²=9/4
3x+1=±3/2
3x=-5/2或3x=1/2
x1=-5/6 x2=1/6