化简|4x-1|-|3x+6|
问题描述：
化简|4x-1|-|3x+6|
答
令4x- 1 = 0，得 x =1/4
令3x + 6 = 0, 得x = -2
当 x |4x-1|-|3x+6|
= -(4x-1)+(3x+6)
=7 - x
当 -2 =|4x-1|-|3x+6|
= -(4x-1) -(3x+6)
= - 7x - 5
当 x > 1/4 时，得
|4x-1|-|3x+6|
= (4x-1) -(3x+6)
=x - 7
答
（1）x