计算分式(a-5)乘以25-a²/a²-10a+25
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计算分式(a-5)乘以25-a²/a²-10a+25
计算分式(a-5)乘以25-a²/a²-10a+25
计算分式(a-5)乘以25-a²/a²-10a+25
原式=(a-5)*[-(a+5)(a-5)/(a-5)²]
=(a-5)*[-(a+5)/(a-5)]
=-(a+5)
=-a-5