Express (2+b)/(a) + (a+b)/(2a) as a single fraction.

The denominators are $a$ and $2a$.
The LCM of $a$ and $2a$ is $2a$.

For the first term, multiply the numerator and denominator by 2:

The second term already has the denominator $2a$:

The expression as a single fraction is $\boxed{\frac{a+3b+4}{2a}}$.

Question 5a: Express $\frac{1}{ab} + \frac{2}{bc} + \frac{3}{ac}$ as a single fraction.

The denominators are $ab, bc,$ and $ac$.
The LCM of $ab, bc,$ and $ac$ is $abc$.

For the first term, multiply the numerator and denominator by $c$:

For the second term, multiply the numerator and denominator by $a$:

For the third term, multiply the numerator and denominator by $b$:

The expression as a single fraction is $\boxed{\frac{2a+3b+c}{abc}}$.

Question 5b: Express $\frac{a}{2} - \frac{2}{ef} + \frac{4}{3f}$ as a single fraction.

The denominators are $2, ef,$ and $3f$.
The LCM of the numerical coefficients (2 and 3) is 6.
The LCM of the variable parts ($ef$ and $f$) is $ef$.
So, the LCM of $2, ef,$ and $3f$ is $6ef$.

For the first term, multiply the numerator and denominator by $3ef$:

For the second term, multiply the numerator and denominator by 6:

For the third term, multiply the numerator and denominator by $2e$:

The expression as a single fraction is $\boxed{\frac{3aef + 8e - 12}{6ef}}$.