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