帮小弟解决个疑惑正数a,b满足a+b+1=ab,则3a+2b的最小值是 (老师给的答案是5+4√3),老师说消掉其中一个未知数用二次函数来算,对题里给的式子变形得到a=b-1分之b+1,代入上式消元再用次均值不
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![帮小弟解决个疑惑正数a,b满足a+b+1=ab,则3a+2b的最小值是 (老师给的答案是5+4√3),老师说消掉其中一个未知数用二次函数来算,对题里给的式子变形得到a=b-1分之b+1,代入上式消元再用次均值不](/uploads/image/z/10374404-68-4.jpg?t=%E5%B8%AE%E5%B0%8F%E5%BC%9F%E8%A7%A3%E5%86%B3%E4%B8%AA%E7%96%91%E6%83%91%E6%AD%A3%E6%95%B0a%2Cb%E6%BB%A1%E8%B6%B3a%2Bb%2B1%3Dab%2C%E5%88%993a%2B2b%E7%9A%84%E6%9C%80%E5%B0%8F%E5%80%BC%E6%98%AF+%EF%BC%88%E8%80%81%E5%B8%88%E7%BB%99%E7%9A%84%E7%AD%94%E6%A1%88%E6%98%AF5%2B4%E2%88%9A3%EF%BC%89%2C%E8%80%81%E5%B8%88%E8%AF%B4%E6%B6%88%E6%8E%89%E5%85%B6%E4%B8%AD%E4%B8%80%E4%B8%AA%E6%9C%AA%E7%9F%A5%E6%95%B0%E7%94%A8%E4%BA%8C%E6%AC%A1%E5%87%BD%E6%95%B0%E6%9D%A5%E7%AE%97%2C%E5%AF%B9%E9%A2%98%E9%87%8C%E7%BB%99%E7%9A%84%E5%BC%8F%E5%AD%90%E5%8F%98%E5%BD%A2%E5%BE%97%E5%88%B0a%3Db-1%E5%88%86%E4%B9%8Bb%2B1%2C%E4%BB%A3%E5%85%A5%E4%B8%8A%E5%BC%8F%E6%B6%88%E5%85%83%E5%86%8D%E7%94%A8%E6%AC%A1%E5%9D%87%E5%80%BC%E4%B8%8D)
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