太简单了@@###提醒一下,"已知5x^2-4xy+y-2x^2+1=0",应该是@@###"5x^2-4xy+y^2-2x+1=0"吧!!依次为#(1+a-b)(1-a+b)(a+b+1)(a+b-1)#(x-y+2)#-23,23,-10,10,-5,5,-2,2#x=1,y=2,(x-y)^2005=-1#(x^2+8x+6)(x^2+4x+6)
