解析
9x²-9x-(4x-2x²)=8x²-2x
9x²-9x-4x+2x²-8x²+2x=0
3x²-9x=0
3x(x-3)=0
x1=0
x2=3我打错了，应该是3x（2x-3）3x(2x-3)-(4-2x)x=(4x-1)*2x6x²-9x-(4x-2x²)=8x²-2x6x²-9x-4x+2x²-8x²+2x=0-13x+2x=0x=0