Answer:
Step-by-step explanation:
I assume you need help with the first picture:
Let [tex]x=\frac{a}{b} \\y=\frac{c}{d}[/tex]
Then
[tex]x+y=\frac{a}{b} +\frac{c}{d} =\frac{ad}{bd} +\frac{bc}{bd} =\frac{ad+bc}{bd} , b,d\neq 0[/tex]
Clearly you can see that the sum of 2 rational numbers gives a rational number.
