Сторінки 76 – 77

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Завдання 3

(24 – 6) – 5 = 24 – (6 + 5) = 24 – 11 = 13

(80 – 2) – 6 = 80 – (2 + 6) = 80 – 8 = 72

(58 – 3) – 7 = 58 – (3 + 7) = 58 – 10 = 48

(92 – 4) – 9 = 92 – (4 + 9) = 92 – 13 = 92 – 12 – 1 = 79

(15 + 7) + 8 = 15 + (7 + 8) = 15 + 15 = 30

(20 + 8) + 7 = 20 + (8 + 7) = 20 + (8 + 2 + 5) = 20 + 15 = 35

(7 + 41) + 2 = 41 + (7 + 2) = 41 + 9 = 50

(9 + 33) + 10 = (30 + 10) + (9 + 3) = 40 + 12 = 52

47 + 3 – 3 = 47 + (3 – 3) = 47

55 + 5 – 5 = 55 + (5 – 5) = 55

79 – 9 + 9 = 79 + 9 – 9 = 79 + (9 – 9) = 79

99 + 1 – 100 = 100 – 100 = 0

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