Вычисли удобным способом.
68 − (28 + 7)
35 + (5 + 19)
49 − (5 + 19)
60 − (3 + 27)
18 + 39 + 16 + 7
26 + 19 + 27 + 11
68 − (28 + 7) = (68 − 28) − 7 = 40 − 7 = 33
35 + (5 + 19) = (35 + 5) + 19 = 40 + 19 = 59
49 − (5 + 19) = (49 − 19) − 5 = 30 − 5 = 25
60 − (3 + 27) = 60 − 30 = 30
18 + 39 + 16 + 7 = (18 + 2) + (39 + 1) + (16 − 1) + (7 − 2) = 20 + 40 + 15 + 5 = 60 + 20 = 80
26 + 19 + 27 + 11 = (26 + 4) + (19 + 1) + (27 − 4) + (11 − 1) = 30 + 20 + 23 + 10 = 60 + 23 = 83