1、(x²-x)²-5(x²-x)+6=0
问题描述：
1、(x²-x)²-5(x²-x)+6=0
2、x+1/x² - 2x²/x+1=1
答
1.设(x²-x)为y,则y²-5y+6=0(y+1)(y-6)=0y1=6 y2= -1x²-x=6x²-x-6=0(x+2)(x-3)=0x1= -2 x2=3x²-x= -1x²-x+1=0△=b²-4ac=(-1)²-4×1×1= -3＜0所以无解综合x1 =-2 ,x2 = 32....