а) 10a = 30
10a * 2 = 30 * 2
20a = 60
6b = 12
6b * 2 = 12 * 2
12b = 24
б) 4a = 20
4a * 2 = 20 * 2
8a = 40
8b = 16
8b * 2 = 16 * 2
16b = 32
10×3=30 6×2=12
4×5=20 8×2=16
а) 10a = 30
10a * 2 = 30 * 2
20a = 60
6b = 12
6b * 2 = 12 * 2
12b = 24
б) 4a = 20
4a * 2 = 20 * 2
8a = 40
8b = 16
8b * 2 = 16 * 2
16b = 32
10×3=30 6×2=12
4×5=20 8×2=16