1. 28 + (39 + 15) = 82
(4 х 6) : 8 = 3
(6 х 7) - 29 = 13
(23 -14) х (5 + 4) = 81
(36 : 4) + 28 = 37
(45 + 18) : (11 - 4) = 9
2. 70 - 6 = 64
65 + 26 = 91
92 - 39 = 53
35 + 3 = 38
80 - 12 = 68
45 + 28 = 78
76 - 29 = 47
23 + 49 = 72
71 - 59 = 12
3.
1.) 43 - 15 = 28 (ящ.) - ящики с бананами
2.) 43 + 28 = 71 (ящ.)
Ответ: 71 ящик
4.
х * 7 = 42
х = 42 : 7
х = 6
6 * 7 = 42
72 - х = 25
х = 72 - 25
х = 47
72 - 47 = 25
5. P = (7 + 2) * 2
P = 18 см