现在改成www.dfgdh54.coma=-1，b=-1,求a2+ba2=1-1=0' （2x+y)2(2x-y)2'=（2x2-y2）2' （x-y+1)2-(y-1)2=（x-y+1+y-1）（x

现在改成www.dfgdh54.coma=-1，b=-1,求a2+ba2=1-1=0' （2x+y)2(2x-y)2'=（2x2-y2）2' （x-y+1)2-(y-1)2=（x-y+1+y-1）（x