Question

помогите стр. 29 упр 5 3 класс математика​

Answer 1

Это?

38 : 19 + 42 : 3 = 2 + (30 + 12) : 3 = 2 + (30 : 3 + 12 : 3) = 2 + 10 + 4 = 12 + 4 = 16

16 * 6 : 3 − 30 = (10 + 6) * 6 : 3 − 30 = (90 + 6) : 3 − 30 = 90 : 3 + 6 : 3 − 30 = 30 + 2 − 30 = 32 − 30 = 2

28 : 2 * 3 + 8 = (20 + 8) : 2 * 3 + 8 = (20 : 2 + 8 : 2) * 3 + 8 = (10 + 4) * 3 + 8 = 10 * 3 + 4 * 3 + 8 = 30 + 12 + 8 = 42 + 8 = 50

(47 + 8) : 11 = 55 : 11 = 5

(86 − 72) * 5 = 14 * 5 = (10 + 4) * 5 = 10 * 5 + 4 * 5 = 50 + 20 = 70

90 − 9 : 9 = 90 − 1 = 89

3 * (72 − 60) = 3 * 12 = 3 * (10 + 2) = 3 * 10 + 3 * 2 = 30 + 6 = 36

4 * (91 − 80) = 4 * 11 = 4 * (10 + 1) = 4 * 10 + 4 * 1 = 40 + 4 = 44

82 − 25 : 5 = 82 − 5 = 77