[Toán 8]Rút gọn

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popstar1102



đặt $A=\frac{x^4y-xy^4}{x^2+xy+y^2}$

\Leftrightarrow $A=\frac{xy(x^3-y^3)}{x^2+xy+y^2}$

\Leftrightarrow $A=\frac{xy(x-y)(x^2+xy+y^2)}{x^2+xy+y^2}$

\Leftrightarrow A=xy(x-y)
 
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