Упростите выражение.
1) 3a + 6a =
2) 15b + 9b =
3) 14x + x =
4) 18y − 5y =
5) 10c − c =
6) 2a + 7a + 9a =
7) 12k − 8k + 16k =
8) 13d + 4d + 15 =
3a + 6a = (3 + 6) * a = 9 * a = 9a
15b + 9b = (15 + 9) * b = 24 * b = 24b
14x + x = (14 + 1) * x = 15 * x = 15x
18y − 5y = (18 − 5) * y = 13 * y = 13y
10c − c = (10 − 1) * c = 9 * c = 9c
2a + 7a + 9a = (2 + 7 + 9) * a = 18 * a = 18a
12k − 8k + 16k = (12 − 8 + 16) * k = 20 * k = 20k
13d + 4d + 15 = (13d + 4d) + 15 = (13 + 4) * d + 15 = 17 * d + 15 = 17d + 15
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