Question

tìm x:

bằng cả 2 cách nhé

a)/5x-4/=/x+2/

b)/2+3x/=/4x-3/

 

Answer 1

a)|5x-4|=|x+2|

<=>\(\left[\begin{array}{nghiempt}5x-4=x+2\\5x-4=-x-2\end{array}\right.\)<=>x=3/2 hoặc x=1/3

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

<=>\(\left[\begin{array}{nghiempt}2+3x=3-4x\\2+3x=4x-3\end{array}\right.\)<=>x=1/7 hoặc x=5