Question

\(\dfrac{9+x}{13-x}=\dfrac{5}{6}\)

Answer 1

giúp mính với mình cần gấp

 

Answer 2

\(ĐKXĐ:x\ne13\)

\(\Leftrightarrow54+6x=65-5x\Leftrightarrow11x=65-54=11\Leftrightarrow x=1\left(TM\right)\)

Answer 3

 \(\rightarrow6\cdot\left(9+x\right)=5\cdot\left(13-x\right)\\ \rightarrow54+6x=65-5x\\ \rightarrow6x+5x=65-54\\ \rightarrow11x=11\\ x=11:11\\ \rightarrow x=1\)