Question

15 баллов)
Буду оочень благодарна!

Answer 1

$9) frac{x^2+3x}{3a+ax} = frac{x(x+3)}{a(3+x)} =frac{x(x+3)}{a(x+3)}= frac{x}{a} \ \ 10) frac{b^2}{b^2+bc} = frac{b*b}{b*(b+c)} = frac{b}{b+c} \ \ 11) frac{2a+4}{a^2-4} = frac{2(a+2)}{a^2-2^2} = frac{2(a+2)}{(a-2)(a+2)} = frac{2}{a-2} \ \ 12) frac{x^2-y^2}{x^2-xy} = frac{(x-y)(x+y)}{x(x-y)} = frac{x+y}{x} = frac{x}{x} + frac{y}{x} = frac{y}{x} +1$