✔ 最佳答案
If it were 5 over 8 + 1 over 12 you wouldn't hesitate: Multiply the denominators to find a common denom., convert the given fractions to equivilent fractions with the common denom. and add. Do the same thing: Multiply denominators: (x^2) x (x^2 + x) = x^4 + x^3
5 over x^2 = 5x^2 + 5x over x^4 + x^3
1 over x^2 + x = x^2 over x^4 + x^3
Add the numerators: 5x^2 + 5x + x^2 yields 6x^2 +5x over x^4 + x^3
Now, can't you get rid of one "x"? I think the answer is 6x +5 over x^3 + x^2