Question

пж :( ........................

Answer 1

Ответ:

1)$3 \times 7 = 21$

см²

2)

$3 \times 4 = 12$

см²

3)

$4 \times 7 = 28$

см²

4)

$21 \times 2 + 12 \times 2 + 28 \times 2$

$42 + 24 + 56 = 122$