✔ 最佳答案
you want to make the fractions so that they have the same denominator, then you can add them.
so if you multiplied the first one by a/a (this equals one, so it won't change the value of the fraction), you would get 5a^2/2ab
and if you multiplied the second one by b/b, you would get 3b^2/2ab
so now we have 5a^2/2ab + 3b^2/2ab
since they have the same denominator, you can just add the numerators:
= (5a^2 + 3b^2)/2ab