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数学
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10b(x-y)2-5a(y-x)2
人气:476 ℃ 时间:2020-05-26 20:12:35
解答
10b(x-y)² -5a(y-x)²
=10b(x-y)² -5a(x-y)²
=5(x-y)²(2b-a)细讲一下(y-x)与(x-y)是相反数,但其平方是一样的(x-y)² =(x-y)²10b(x-y)² -5a(x-y)²中共同含有5(x-y)²项,提取公因式得10b(x-y)² -5a(y-x)²=10b(x-y)² -5a(x-y)²=5(x-y)²(2b-a)
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