1. | 2X-1 | = |3X +1 | 2. | 1/2x - 2 | -3 = a 想问下这两道题目. 方程里有绝对值该怎么处理?
问题描述:
1. | 2X-1 | = |3X +1 | 2. | 1/2x - 2 | -3 = a 想问下这两道题目. 方程里有绝对值该怎么处理?
1.| 2X-1 | = |3X +1 |
2. | 1/2x - 2 | -3 = a
答
1)2X-1=±(3x+1)
2X-1=3x+1 OR 2X-1=-3x-1
x=-2 or x=0
2)1/2x - 2=±(a+3)
1/2x - 2=a+3 1/2x - 2=-a-3
x=2(a+5) x=2(-1-a)