Question

Помогите решит 3 примера

Answer 1

nx + ny + 10x + 10y = (nx + ny) + (10x + 10y) = n(x + y) + 10(x + y) = (x + y)(n + 10)

9x + 9y + ax + ay = 9(x + y) + a(x + y) = (x + y)(9 + a)

$\frac{ax+ay-x-y}{y^{2}+xy } =\frac{(ax+ay)-(x+y)}{y(y+x)} =\frac{a(x+y)-(x+y)}{y(y+x)}=\frac{(x+y)(a-1)}{y(y+x)}=\frac{a-1}{y}$