1.（x+6）²-9=x²+12x+36-9=x²+12x+27=(x+3)(x+9)=0 x1=-3 x2=-9
2.（x-2）²=（3x+4)²x²-4x+4=9x²+24x+168x²+28x+12=0 2x²+7x+3=0
(x+3)(2x+1)=0x1=-3x2=-1/2
3.x²-2√2x+1=(x-√2)²-1=0 (x-√2)²=1x1=1+√2x2=-1+√2
4.2x²-3x+1=2(x-3/4)²-1/8=0 (x-3/4)²=1/16x1=1 x2=1/2
公式： x=(-b±√b^2-4ac)/2a自己带吧
5.x1=9 x2=-2 6.x1=√2/2 x2=√2
7.(2y+1)²-2(2y+1)=0(2y-1)(2y+1)=0y1=1/2y2=-1/2
8.(x-7)(x+4)=0x1=7 x2=-4
希望我的回答对你有帮助!