Question

Bài 3:

a) \(\dfrac{x+2}{9}\)+\(\dfrac{x+2}{11}\)=\(\dfrac{x+2}{13}\)+\(\dfrac{x+2}{15}\)

Answer 1

\(\Rightarrow\left(x+2\right)\left(\dfrac{1}{9}+\dfrac{1}{11}-\dfrac{1}{13}-\dfrac{1}{15}\right)=0\\ \Rightarrow x=2\left(\dfrac{1}{9}+\dfrac{1}{11}-\dfrac{1}{13}-\dfrac{1}{15}\ne0\right)\)