2(x+y)(x-y)+【(x+y)²-xy】+【(x-y)²+xy】
=2(x²-y²)+x²+2xy+y²-xy+x²-2xy+y²+xy
=2x²-2y²+2x²+2y²
=4x²
化简后,式子里没有y,所以把y=2010错抄成y=2001,结果不受影响.
2(x+y)(x-y)+【(x+y)²-xy】+【(x-y)²+xy】
=2(x²-y²)+x²+2xy+y²-xy+x²-2xy+y²+xy
=2x²-2y²+2x²+2y²
=4x²
化简后,式子里没有y,所以把y=2010错抄成y=2001,结果不受影响.