Условие:

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2 * (4 * 5)
3 * (3 * 10)
42 − (19 + 12)
(28 + 37) + 12
6 * 9 + (27 + 26)
8 * 7 − (4 * 4 + 14)

2 * (4 * 5) = (2 * 5) * 4 = 10 * 4 = 40
3 * (3 * 10) = (3 * 3) * 10 = 9 * 10 = 90
42 − (19 + 12) = (42 − 12) − 19 = 30 − 19 = 11
(28 + 37) + 12 = (28 + 12) + 37 = 40 + 37 = 77
6 * 9 + (27 + 26) = 54 + (27 + 26) = (54 + 26) + 27 = 80 + 27 = 107
8 * 7 − (4 * 4 + 14) = 56 − (16 + 14) = 56 − 30 = 26