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1-\frac{x^{2}-xy-y^{2}}{\left(x+y\right)\left(x-y\right)}
因數分解 x^{2}-y^{2}。
\frac{\left(x+y\right)\left(x-y\right)}{\left(x+y\right)\left(x-y\right)}-\frac{x^{2}-xy-y^{2}}{\left(x+y\right)\left(x-y\right)}
若要對運算式相加或相減,請先通分使其分母相同。 1 乘上 \frac{\left(x+y\right)\left(x-y\right)}{\left(x+y\right)\left(x-y\right)}。
\frac{\left(x+y\right)\left(x-y\right)-\left(x^{2}-xy-y^{2}\right)}{\left(x+y\right)\left(x-y\right)}
因為 \frac{\left(x+y\right)\left(x-y\right)}{\left(x+y\right)\left(x-y\right)} 和 \frac{x^{2}-xy-y^{2}}{\left(x+y\right)\left(x-y\right)} 的分母相同,所以將分子相減即可相減這兩個值。
\frac{x^{2}-xy+yx-y^{2}-x^{2}+xy+y^{2}}{\left(x+y\right)\left(x-y\right)}
計算 \left(x+y\right)\left(x-y\right)-\left(x^{2}-xy-y^{2}\right) 的乘法。
\frac{xy}{\left(x+y\right)\left(x-y\right)}
合併 x^{2}-xy+yx-y^{2}-x^{2}+xy+y^{2} 中的同類項。
\frac{xy}{x^{2}-y^{2}}
展開 \left(x+y\right)\left(x-y\right)。
1-\frac{x^{2}-xy-y^{2}}{\left(x+y\right)\left(x-y\right)}
因數分解 x^{2}-y^{2}。
\frac{\left(x+y\right)\left(x-y\right)}{\left(x+y\right)\left(x-y\right)}-\frac{x^{2}-xy-y^{2}}{\left(x+y\right)\left(x-y\right)}
若要對運算式相加或相減,請先通分使其分母相同。 1 乘上 \frac{\left(x+y\right)\left(x-y\right)}{\left(x+y\right)\left(x-y\right)}。
\frac{\left(x+y\right)\left(x-y\right)-\left(x^{2}-xy-y^{2}\right)}{\left(x+y\right)\left(x-y\right)}
因為 \frac{\left(x+y\right)\left(x-y\right)}{\left(x+y\right)\left(x-y\right)} 和 \frac{x^{2}-xy-y^{2}}{\left(x+y\right)\left(x-y\right)} 的分母相同,所以將分子相減即可相減這兩個值。
\frac{x^{2}-xy+yx-y^{2}-x^{2}+xy+y^{2}}{\left(x+y\right)\left(x-y\right)}
計算 \left(x+y\right)\left(x-y\right)-\left(x^{2}-xy-y^{2}\right) 的乘法。
\frac{xy}{\left(x+y\right)\left(x-y\right)}
合併 x^{2}-xy+yx-y^{2}-x^{2}+xy+y^{2} 中的同類項。
\frac{xy}{x^{2}-y^{2}}
展開 \left(x+y\right)\left(x-y\right)。