= 36 42 Х 2 3 52 x x x x 4 -- = 38 = - 48 х = 56 72 51 х 3 X X X X Я 4. 64 = = 74 - - 57 Х = 72

18×2=36
19x2=38
14x3=42
16x3=48
13x4=52
14×4=56
36x2=72
37×2=74
17x3=51
19x3=57
4x16=64
18x4=72