Add or subtract

Question

2/x^2+1/x

2/x+3/2x-3/5x

7/x^2+5/x

help me step by step

Answer 1

Create common denominators for all terms and add the numerators.

In the first case,

2/x^2 + 1/x = 2/x^2 + x/x^2 = (2+x)/x^2