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数学
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X^2-y^2+2y-1 (因式分解)
人气:241 ℃ 时间:2020-01-26 14:53:24
解答
x²-y²+2y-1
=x²-(y²-2y+1)
=x²-(y-1)²
=[x+(y-1)][x-(y-1)]
=(x+y-1)(x-y+1)
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