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因式分解X^2-Y^2+Y-1/4
人气:449 ℃ 时间:2020-05-25 01:13:33
解答
X^2-Y^2+Y-1/4 =X^2-(Y^2-Y+(1/2)^2 =X^2-(Y-1/2)^2 =(x+y-1/2)(x-y+1/2)
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