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因式分解:x^2-y^2-4x-6y-13
人气:382 ℃ 时间:2020-04-26 19:38:01
解答
x²-y²-4x-6y-5
=(x²-4x+4)-(y²+6y+9)
=(x-2)²-(y+3)²
=(x-2+y+3)(x-2-y-3)
=(x+y+1)(x-y-5)
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