2(y-x)³/x-y,约分
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2(y-x)³/x-y,约分2(y-x)³/x-y,约分2(y-x)³/x-y,约分2(y-x)³/(x-y)=-2(x-y)³/(x-y)=-2(x
2(y-x)³/x-y,约分
2(y-x)³/x-y,约分
2(y-x)³/x-y,约分
2(y-x)³/(x-y)
=-2(x-y)³/(x-y)
=-2(x-y)²
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我时刻准备着!
=-2(x-y)²/(x-y)
=-2(x-y)²