Question

3 простых номера решите пж.

Answer 1

$4)\frac{5}{a-b}-\frac{2}{a+b}=\frac{5*(a+b)-2*(a-b)}{(a+b)(a-b)}=\frac{5a+5b-2a+2b}{a^{2}-b^{2}}=\boxed{\frac{3a+7b}{a^{2} -b^{2}}}\\\\\\5)\frac{c-6}{c^{2}-4 }+\frac{3}{c+2}= \frac{c-6}{(c+2)(c-2) }+\frac{3}{c+2}=\frac{c-6+3*(c-2)}{(c+2)(c-2)}=\frac{c-6+3c-6}{(c+2)(c-2)}=\boxed{\frac{4c-12}{c^{2}-4 }}\\\\\\6)\frac{2m^{2} }{m-5}-2m=\frac{2m^{2}-2m*(m-5) }{m-5} =\frac{2m^{2}-2m^{2}+10m}{m-5}=\boxed{\frac{10m}{m-5}}$