Question

Пожалуйста, ребят! Помогите мне!

Answer 1

$1)\frac{1}{4k+h}-\frac{1}{4k-h}=\frac{4k-h-(4k+h)}{(4k+h)(4k-h)}=\frac{4k-h-4k-h}{16k^{2} -h^{2} }=\boxed{\frac{-2h}{16k^{2}-h^{2}}}\\\\\\2)\frac{7}{m+5} -\frac{7m-3}{m^{2}+5m }=\frac{7}{m+5} -\frac{7m-3}{m(m+5)}=\frac{7m-(7m-3)}{m(m+5)}=\\\\=\frac{7m-7m+3}{m^{2}+5m } =\boxed{\frac{3}{m^{2}+5m }}$