若|ax+1|<=b之解為|-2<=x<=12| 求2a+b之值? 請各位高手解答，謝謝?
回答 (1)
2018-08-31 7:14 pm
✔ 最佳答案
若｜ax+1｜<=b之解為－2<=x<=12求2a+b之值?Sol
－2<=x<=12
－2－5<=x－5<=12－5
－7<=x－5<=7
｜x－5｜<=7
｜－x+5｜<=7
｜－x+5｜/5<=7/5
｜－x/5+1｜<=7/5
a=－1/5，b=7/5
2a+b=1
收錄日期: 2021-04-30 22:40:59
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20180831072546AAFy3c2