2x²-5xy+2y²+3x-3y+1
2x²-5xy+2y²+3x-3y+1
数学人气：969 ℃时间：2020-06-06 03:50:25
优质解答
2x²-5xy+2y²+3x-3y+1
=2x²+(3-5y)x+2y²-3y+1
=2x²+(3-5y)x+(1-y)(1-2y) （利用的是十字相乘法）
=(x-2y+1)(2x-y+1)
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