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Ответ:

1)3

2*4 = 8*2 = 16

44/2 = 22

22 - 16 = 6

6 / 2 = 3

2)6

8+2+2 = 12

76-2-2=72

72/12 = 6

3)4

17-3-3 = 11

38+3+3 = 44

44 / 11 = 4

4)8

(5*3 - b)*3*3-b = 55

(15-b)*9-b = 55

135-9b-b=55

-10b = -80

b = 8

5)9

78-3-3=72

2+3+3 = 8

72/8 = 9