若正数a.b满足ab=a+b+3,则ab的取值范围为?请帮忙找出一下解法的错误:ab=a+b+3≥2倍根下 3(a+b)=2倍根下 3(ab-3)即a²b²≥12(ab-3)即a²b²-12ab+36≥0△=0ab≥0正确答案是ab>=9 请问哪
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/28 23:56:10
![若正数a.b满足ab=a+b+3,则ab的取值范围为?请帮忙找出一下解法的错误:ab=a+b+3≥2倍根下 3(a+b)=2倍根下 3(ab-3)即a²b²≥12(ab-3)即a²b²-12ab+36≥0△=0ab≥0正确答案是ab>=9 请问哪](/uploads/image/z/1604671-7-1.jpg?t=%E8%8B%A5%E6%AD%A3%E6%95%B0a.b%E6%BB%A1%E8%B6%B3ab%3Da%2Bb%2B3%2C%E5%88%99ab%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%E4%B8%BA%3F%E8%AF%B7%E5%B8%AE%E5%BF%99%E6%89%BE%E5%87%BA%E4%B8%80%E4%B8%8B%E8%A7%A3%E6%B3%95%E7%9A%84%E9%94%99%E8%AF%AF%EF%BC%9Aab%3Da%2Bb%2B3%E2%89%A52%E5%80%8D%E6%A0%B9%E4%B8%8B+3%EF%BC%88a%2Bb%EF%BC%89%EF%BC%9D2%E5%80%8D%E6%A0%B9%E4%B8%8B+3%EF%BC%88ab-3%EF%BC%89%E5%8D%B3a%26sup2%3Bb%26sup2%3B%E2%89%A512%EF%BC%88ab-3%EF%BC%89%E5%8D%B3a%26sup2%3Bb%26sup2%3B-12ab%2B36%E2%89%A50%E2%96%B3%3D0ab%E2%89%A50%E6%AD%A3%E7%A1%AE%E7%AD%94%E6%A1%88%E6%98%AFab%3E%3D9+%E8%AF%B7%E9%97%AE%E5%93%AA)
xSn@*qT~@*HPpIp ZPpS"Q'~c/+*}wf9g6Lzw2D>! K UۍszYh1f`B>]֙12;6 z]`c5vuV"kOn,KXy,Ozs)y*#/pU);Kewv:* P}֧q1ܿIb_{ob<*"\Y<&hO
}Xd"OӠqsLsDYt8́m{an2 #+~!?Á=HOӰPR>p >@(#)J%#)R1x_81LǙ[vfSiE~6vi