Question

15. Efectuează: 10 x 7 + 7 x 1
10 x 7 – 5 x 7 =
7 x 7 – 6×6 - 3 x 3 =
1 x 2 x 3 + 4 x 5 + 6 x 7 = -​

Answer 1

Răspuns:

$10 \times 7 + 7 \times 1 = 77 \\ 10 \times 7 - 5 \times 7 = 35 \\ 7 \times 7 - 6 \times 6 - 3 \times 3 = 4 \\ 1 \times 2 \times 3 + 4 \times 5 + 6 \times 7 = 68$