化简:(2x+y)(2x-y)+(x+y)^2-2(2x^2-xy)
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化简:(2x+y)(2x-y)+(x+y)^2-2(2x^2-xy)
化简:(2x+y)(2x-y)+(x+y)^2-2(2x^2-xy)
化简:(2x+y)(2x-y)+(x+y)^2-2(2x^2-xy)
(2x+y)(2x-y)+(x+y)^2-2(2x^2-xy)
=4x²-y²+x²+2xy+y²-4x²+2xy
=x²+2xy+2xy
=x²+4xy
=x(x+4y)