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数学
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因式分解:x²-4(x-1) 2x²+4x+2
人气:463 ℃ 时间:2019-09-06 21:43:57
解答
x²-4(x-1)
=x^2-4x+4
=x^2-4x+2^2
=(x-2)^2
2x²+4x+2
=2(x^2+2x+1)
=2(x+1)^2
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