9X^2=(X-1)^2
问题描述:
9X^2=(X-1)^2
答
9X^2=(X-1)^2
9X^2=X^2-2X+1
8X^2+2X-1=0
(4X-1)(2X+1)=0
4X -1=0 或 2X+1=0
X=1/4 或 X= -1/2