(2x-y)^2-4(x-y)(x+2y)答案是9y^2-8xy```

(2x-y)^2-4(x-y)(x+2y)答案是9y^2-8xy```

4x^2+y^2-4xy-4(x^2-xy+2xy-2y^2)展开化简吧!======以下答案可供参考======供参考答案1:(2x-y)^2-4(x-y)(x+2y) =4x^2-4xy+y^2-4x^2-4xy+8y^2=8y^2-8xy=8y(y-x)供参考答案2:不会供参考答案3:(2x-y)^2-4(x-y)(x+2y)=(4x^2-2xy+y^2)-4x(x^2-xy+2xy-2y^2)=4x^2-2xy+y^2-4x^2+4xy-8xy+8^2=-6xy+9y^2展开,合并同类项

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