Question

$frac{m+n}{3x}+ frac{3m-n}{3x}$
$frac{x+4y}{4a^2}+ frac{3x-2y}{4a^2}$
$frac{a+2b}{5b}+ frac{2b-a}{5b}$
$frac{15m-6n}{y^4}+ frac{9m-n}{y^4}$

Answer 1

1)(m+n+3m-n)/3x=4m/3x
2)(x+4y+3x-2y)/4a²=(4x+2y)/4a²=(2x+y)/2a²
3)(a+2b+2b-a)/5b=7b/5b=7/5=1,4
4)(15m-6n+9m-n)/y^4=(24m-7n)/y^4