Question

Bài 1: Tìm x, biết:

a) \(2\left|x-3\right|+\left|2x+5\right|=11\)

b) \(\left|x-3\right|+\left|5-x\right|+2\left|x-4\right|=2\)

(Các bạn giúp mình nha)

Answer 1

a) 2|x-3|+|2x+5|=11

2x-6+2x+5=11

2x+2x = 11-5+6

4x = 12

x= \(\dfrac{12}{4}\)

x= 3

vậy x =3

b) |x-3| +|5-x| +2|x-4|=2

x-3+5-x+2x-8=2

x-x+2x = 2+3-5+8

2x = 8

x = \(\dfrac{8}{2}\)

x=4

vậy x = 4