计算：(x-2y)^2-x(2x+y)
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计算：(x-2y)^2-x(2x+y)计算：(x-2y)^2-x(2x+y)计算：(x-2y)^2-x(2x+y)(x-2y)^2-x(2x+y)=x^2-4xy+4y^2-2x^2-xy=-x^2-
计算：(x-2y)^2-x(2x+y)
计算：(x-2y)^2-x(2x+y)
计算：(x-2y)^2-x(2x+y)
(x-2y)^2-x(2x+y)
=x^2-4xy+4y^2-2x^2-xy
=-x^2-5xy+4y^2
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