Question

b) \(\dfrac{4x-5}{5-x}>4\)

Answer 1

Đề: Tìm x, biết:

Answer 2

\(\dfrac{4x-5}{5-x}>4\left(dkxd:x\ne5\right)\)

\(\Leftrightarrow\dfrac{4x-5-4\left(5-x\right)}{5-x}>0\)

\(\Leftrightarrow4x-5-20+4x>0\)

\(\Leftrightarrow8x>25\)

\(\Leftrightarrow x>\dfrac{25}{8}\)

Answer 3

4x-5/5-x>4

=>\(\dfrac{4x-5-20+4x}{5-x}>0\)

=>\(\dfrac{8x-25}{x-5}< 0\)

=>8x-25>0 và x-5<0

=>25/8<x<5