数学题,通分,最好写一下步骤,谢谢啦
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x/(x²-x-2)=x/(x-2)(x+1) 1/(x-2)
∴ 公分母:(x-2)(x+1)
∴x/(x²-x-2)=x/(x-2)(x+1) 1/(x-2)=(x+1)/(x-2)(x+1)
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1/(x-y)² 1/(x²-3xy+2y²)=1/(x-2y)(x-y)
∴公分母:(x-y)²(x-2y)
∴1/(x-y)²=(x-2y)/(x-y)²(x-2y) (x-y)/(x-y)²(x-2y)
∴ 公分母:(x-2)(x+1)
∴x/(x²-x-2)=x/(x-2)(x+1) 1/(x-2)=(x+1)/(x-2)(x+1)
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1/(x-y)² 1/(x²-3xy+2y²)=1/(x-2y)(x-y)
∴公分母:(x-y)²(x-2y)
∴1/(x-y)²=(x-2y)/(x-y)²(x-2y) (x-y)/(x-y)²(x-2y)
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