Question

значение выражения -3с-54-c^2 + 3-2cc^2-4 при с=-3

Answer 1

$frac{-3c-5}{4-c^2} + frac{3-2c}{c^2-4} = frac{-3c-5}{4-c^2} - frac{3-2c}{4-c^2} = frac{-3c-5-3+2c}{4-c^2} =frac{-c-8}{4-c^2}$
$frac{3-8}{4-9} =1$

Answer 2

-3с-54-c^2 + 3-2cc^2-4 = (3c+5)/(c2-4)+(3-2c)/c2-4=(c+8)/(c-2)(c+2)
при с=-3
-3+8/(-3-2)(-3+2)=5/-5*-1=1