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4(x-y)²-20(y-x)+5 分解公因式
人气:433 ℃ 时间:2020-02-05 12:14:32
解答
是
4(x-y)²-20(y-x)+25
==4(x-y)²+20(x-y)+25
=【2(x-y)+5]²
=(2x-2y+5)²
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