Question

выполните действия: m-4/m-m-3/m+1 ; y+3/4y(y-3)-y-3/4y(y+3) ; помогитеааааааааааааааа

Answer 1

$frac{m-4}{m}- frac{m-3}{m+1}= frac{(m-4)(m+1)-m(m-3)}{m(m+1)}=$
$= frac{m^2-3m-4-m^2+3m}{m(m+1)}=-frac{4}{m(m+1)}$
$frac{y+3}{4y(y-3)}- frac{y-3}{4y(y+3)}=frac{(y+3)^2-(y-3)^2}{4y(y-3)(y+3)}=$
$=frac{y^2+6y+9-y^2+6y-9}{4y(y-3)(y+3)}=frac{12y}{4y(y-3)(y+3)}=frac{3}{(y-3)(y+3)}$