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因式分解x平方-6xy+9y平方-10x+30y+25
人气:169 ℃ 时间:2019-11-03 19:33:29
解答
x²-6xy+9y²-10x+30y+25
=(x-3y)²-(10x-30y)+25
=(x-3y)²-10(x-3y)+25
=(x-3y-5)²
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