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数学
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X平方加14X减48等于0
人气:116 ℃ 时间:2020-03-15 00:51:19
解答
x²+14x-48=0
x²+14x+49=48+49
(x+7)²=97
x+7=±√97
x1=√97-7,x2=-√97-7
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