Question

N 6.23. Сократите дробь

Answer 1

3.
$frac{ab+ac+b^2+bc}{ax+ay+bx+by} = frac{a(b+c)+b(b+c)}{a(x+y)+b(x+y)} = frac{(a+b)(b+c)}{(a+b)(x+y)} = frac{b+c}{x+y}$
4.
$frac{(a+b)^2-c^2}{a+b+c} = frac{(a+b-c)(a+b+c)}{(a+b+c)}=a+b-c$