Resposta :
Fatorando:
a) (ab + ac) / (b + c) = a(b + c) / (b + c) = a
b) (x³ - 2x² + 3x - 6) / (x² + 3) = [x(x^2 + 3) - (2(x^2 + 3)] / (x^2 + 3)
= (x^2 + 3).(x - 2) / (x^2 + 3) = x - 2
c) (x³ + x² + x + 1) / (x² + 1) = [x^2(x + 1) + (x + 1)] / (x^2 + 1)
= (x + 1)(x^2 + 1) / (x^2 + 1) = x + 1
Ok??