Question

01) Calcule o valor numérico de xy + 2xy – 3, para x = 1 e y = -1​

Answer 1

$xy + 2xy - 3 \\ 1 \times ( - 1) + 2 \times 1 \times ( - 1) - 3 \\ - 1 + 2 \times ( - 1) - 3 \\ - 1 + ( - 2) - 3 \\ - 1 - 2 - 3 \\ - 3 - 3 \\ - 6$