令2x²-3x=y 则原方程可化为：(y+1)²=11y+1 y²+2y-11y=0 y(y-9)=0 y1=0,y2=9 当y1=0时,2x²-3x=0,x1=0,x2=3/2 当y2=9时,2x²-3x=9,x3=3,x4=-3/2 ...