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数学
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-30ab-30bc 30ca＞30αx y β11x 30y
人气：185 ℃ 时间：2020-01-27 17:35:22
解答
an-11-an!为排列a11a30……an2330...11 2311%/2330-11
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(x+5)(x-6)=x平方+11x+30
解方程（11x-3）（11x-30）+1404=（11x-3）²
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