Помогите 504 номер!!!! Пожалуйста

[latex] \frac{ax+ay-bx-by}{ax-ay-bx+by}=\frac{a(x+y)-b(x+y)}{a(x-y)-b(x-y)}=\frac{(a-b)(x+y)}{(a-b)(x-y)}=\frac{x+y}{x-y}[/latex] [latex] \frac{ac-bc+ad-bd}{ac+bc+ad+bd} =\frac{c(a-b)+d(a-b)}{c(a+b)+d(a+b)}=\frac{(c+d)(a-b)}{(c+d)(a+b)}=\frac{a-b}{a+b}[/latex] [latex] \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}[/latex] [latex] \frac{(a+b)^2-c^2}{a+b+c}=\frac{(a+b-c)(a+b+c)}{a+b+c}=a+b-c [/latex]