Explicație pas cu pas:
[tex]2 \times (100 + 55) = 2 \times (100 + 55) \\ 2 \times 155 = 2 \times 100 + 2 \times 55 \\ 310 = 200 + 110 \\ 310 = 310[/tex]
[tex]87 \times (2 + 4) = 87 \times (2 + 4) \\ 87 \times 6 = 87 \times 2 + 87 \times 4 \\ 522 = 174 + 348 \\ 522 = 522[/tex]
[tex]9 \times (518 + 287) = 9 \times (518 + 287) \\ 9 \times 805 = 9 \times 518 + 9 \times 287 \\ 7245 = 4662 + 2583 \\ 7245 = 7245[/tex]
