Respostas
Resposta:
Explicação passo-a-passo:
a) x + 2y - 1 =
5 + 2.2 - 1 =
5 + 4 - 1 =
8.
x² + 2xy =
5² + 2.5.2 =
25 + 20 =
45.
2xy + y + 5 =
2.5.2 + 2 + 5 =
20 + 2 + 5 =
27.
5y + 4x =
5.2 + 4.5 =
10 + 20 =
30.
b) x + 2y - 1 =
0 + 2.(-3) - 1 =
- 6 - 1 =
- 7.
x² + 2xy =
0² + 2.0.(-3) =
0 + 0 =
0.
2xy + y + 5 =
2.0.(-3) + (-3) + 5 =
0 - 3 + 5 =
2.
5y + 4x =
5.(-3) + 4.0 =
- 15 + 0 =
- 15.
c) x + 2y - 1 =
(-1) + 2.(-6) - 1 =
- 1 - 12 - 1 =
- 14.
x² + 2xy =
(-1)² + 2.(-1).(-6) =
1 + 12 =
13.
2xy + y + 5 =
2.(-1).(-6) + (-6) + 5 =
12 - 6 + 5 =
11.
5y + 4x =
5.(-6) + 4.(-1) =
- 30 - 4 =
- 34.
d) x + 2y - 1 =
0 + 2.0 - 1 =
0 + 0 - 1 =
- 1.
x² + 2xy =
0² + 2.0.0 =
0 + 0 =
0.
2xy + y + 5 =
2.0.0 + 0 + 5 =
0 + 0 + 5 =
5.
5y + 4x =
5.0 + 4.0 =
0 + 0 =
0.
e) x + 2y - 1 =
3 + 2.2 - 1 =
3 + 4 - 1 =
6.
x² + 2xy =
3² + 2.2.3 =
9 + 12 =
21.
2xy + y + 5 =
2.3.2 + 2 + 5 =
12 + 2 + 5 =
19.
5y + 4x =
5.2 + 4.3 =
10 + 12 =
22.