Question

3/x+2 = 5/2x+1

Tim x

Answer 1

đk : x khác -2 ; -1/2 

\(\Rightarrow6x+3=5x+10\Leftrightarrow x=7\left(tmđk\right)\)

Answer 2

ĐKXĐ:\(x\ne-2,x\ne-\dfrac{1}{2}\)

\(\dfrac{3}{x+2}=\dfrac{5}{2x+1}\\ \Leftrightarrow3\left(2x+1\right)=5\left(x+2\right)\\ \Leftrightarrow6x+3=5x+10\\ \Leftrightarrow x=7\left(tm\right)\)

Answer 3

\(\Rightarrow3\cdot\left(2x+1\right)=\left(x+2\right)\cdot5\\ \Rightarrow6x+3=5x+10\\ \Rightarrow6x-5x=10-3\\ \Rightarrow x=7\)