Simplify the following expression:
$\left(\frac{1}{x}+\frac{1}{y}\right)\div\left(x+y\right)$(1x+1y)÷(x+y)
Simplify the following expression:
$\left(\frac{q}{5}+\frac{q}{10}\right)\times\left(\frac{q}{5}-\frac{q}{10}\right)$(q5+q10)×(q5−q10)
Simplify the following expression:
$\frac{x+3}{x+4}\div\frac{x+3}{3}-\frac{1}{x+4}$x+3x+4÷x+33−1x+4
Factorise $\frac{6x-16}{12}$6x−1612 and simplify.