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数学
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这个3(x-1)(x+3)=1怎么算.
人气:168 ℃ 时间:2020-10-01 14:14:59
解答
3x²+6x-9=1
x²+2x=10/3
x²+2x+1=10/3+1
(x+1)²=13/3
x+1=±√39/3
x=(-3-√39)/3,x=(-3+√39)/3
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