Solve the inequalities (3x+1)(x+7)>12x and (2x+15)/9 - (x-1)/5≧x/3.
With clear steps pease!
f.4 a.maths
2007-10-15 4:44 am
回答 (2)
2007-10-15 4:54 am
✔ 最佳答案
As follows~~~圖片參考：http://i182.photobucket.com/albums/x4/A_Hepburn_1990/ineq.jpg?t=1192366457
參考: Myself~~~
2007-10-15 4:52 am
3x^2+21x+x+7>12x
3x^2+10x+7>0
(3x+1)(x+7)>0
-7 -1/3
5(2x+15)-9(x-5)≧5x
10x+75-9x+45≧5x
120 ≧ 4x
30≧x
3x^2+10x+7>0
(3x+1)(x+7)>0
-7 -1/3
5(2x+15)-9(x-5)≧5x
10x+75-9x+45≧5x
120 ≧ 4x
30≧x
收錄日期: 2021-04-13 13:54:49
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071014000051KK05253