Question

помогите пожалуйсто ​

Answer 1

Объяснение:

1)

$\frac{8}{6+x} -\frac{8}{x-7} =\frac{8*(x-7)-8*(x+6)}{(x+6)*(x-7)} =\frac{8x-56-8x+48}{y} =\frac{-8}{(x+6)*(x-7)}=\frac{8}{(x+6)*(7-x)}.$

2)

$\frac{9a^2+y^2}{3a-y} +\frac{6ay}{y-3a}= \frac{9a^2+y^2}{3a-y} -\frac{6ay}{3a-y}= \frac{9a^2-6ay+y^2}{3a-y} =\frac{(3a)^2-2*3a*y+y^2}{3a-y}=\\=\frac{(3a-y)^2}{3a-y}=3a-y.$

3)

$\frac{ay}{a-yb}+\frac{3a-by}{by-a} = \frac{ay}{a-by}-\frac{3a-by}{a-by} =\frac{ay-3a+by}{a-by} .$

4)

$\frac{a^2x^2+36y^2}{ax-6y}+\frac{12axy}{6y-ax}=\frac{a^2x^2+36y^2}{ax-6y}-\frac{12axy}{ax-6y}= \frac{(ax)^2-2*ax*6y+(6y)^2}{ax-6y} =\\=\frac{(ax-6y)^2}{ax-6y} =ax-6y.$