Question

x+3/7+x+3/8+x+3/9+x+3/10=x+3/11

Answer 1

x+x+x+x+3/7+3/8+3/9+3/10-x=3/11

x+x+x+1207/840=3/11

x*3=

Answer 2

Ta có :\(\frac{x+3}{7}+\frac{x+3}{8}+\frac{x+3}{9}+\frac{x+3}{10}=\frac{x+3}{11}\)

\(\Leftrightarrow\frac{x+3}{7}+\frac{x+3}{8}+\frac{x+3}{9}+\frac{x+3}{10}-\frac{x+3}{11}=0\)

\(\Leftrightarrow\left(x+3\right)\left(\frac{1}{7}+\frac{1}{8}+\frac{1}{9}+\frac{1}{10}-\frac{1}{11}\right)=0\)

Mà : \(\left(\frac{1}{7}+\frac{1}{8}+\frac{1}{9}+\frac{1}{10}-\frac{1}{11}\right)\ne0\)

Nên x + 3 = 0 

=> x = -3