:（X十2）x（X十2）一5x（X一1）x（x一1）＝9X一2Xx2X一2
x^2+4x+4-5(x^2-2x+1)=9x-4x^2-2
-4x^2+14x-1=9x-4x^2-2
5x=-1
x=-1/5