Question

упростите выражение m2/2-0- 4m - 25/20- 4m

Answer 1

$frac{m^2}{20-4m}-frac{25}{20-4m}=\\frac{m^2-25}{20-4m}=\\frac{m^2-5^2}{-4*(-5)+(-4)*m}=frac{(m-5)(m+5)}{-4(m-5)}=\\frac{m+5}{-4}=-frac{m+5}{4}$