Question

What is the sum of a-1/abc^3 + 3-b/abc^3

Answer 1

The answer is$\frac{a-b+2}{abc^{3} }$

The expression is $\frac{a-1}{abc^{3} } + \frac{3-b}{abc^{3} }$

Since $\frac{a}{x} + \frac{b}{x} = \frac{a+b}{x}$, then:

$\frac{a-1}{abc^{3} } + \frac{3-b}{abc^{3} } = \frac{a-1+3-b}{abc^{3} }= \frac{a-b-1+3}{abc^{3} }=\frac{a-b+2}{abc^{3} }$