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数学
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已知:(x+m)(x+n)=x^2-6x+8,则2mn-3m-3n=
人气:474 ℃ 时间:2020-05-25 07:22:41
解答
(x+m)(x+n)=x^2+(m+n)x+mn
=x^2-6x+8
m+n=-6,mn=8
2mn-3m-3n=2mn-3(m+n)
=2*8+18=34
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