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5(x²-6x+9)-4=21 解方程
人气:142 ℃ 时间:2020-05-13 20:05:02
解答
5(x²-6x+9)-4=21
5(x²-6x+9)=25
(x-3)²=5
x-3=±√5
x=3±√5
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