Question

Ai giúp mik với

Answer 1

Bài 1: 

a: Ta có: \(\dfrac{x-2}{5}-1=\dfrac{2x-1}{2}\)

\(\Leftrightarrow2x-4-10=10x-5\)

\(\Leftrightarrow-8x=9\)

hay \(x=-\dfrac{9}{8}\)

Answer 2

b: Ta có: \(\dfrac{3}{5-x}=\dfrac{2}{25-x^2}\)

\(\Leftrightarrow3\left(5+x\right)=2\)

\(\Leftrightarrow x=-13\)

c: Ta có: \(x\left(2-x^2\right)+\left(x-2\right)\left(x^2+2x+4\right)>3\)

\(\Leftrightarrow2x-x^3+x^3-8>3\)

\(\Leftrightarrow2x>11\)

hay \(x>\dfrac{11}{2}\)