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a)

in doua moduri: 6 x (3 + 2)
modul 1: 6 x (3 + 2) = 6 x 5 = 30
modul 2: 6 x (3 + 2) = 6 x 3 + 6 x 2 = 18 + 12 = 30

in doua moduri: (5 + 4) x 10
modul 1: (5 + 4) x 10 = 9 x 10 = 90
modul 2: (5 + 4) x 10 = 10 x 5 + 10 x 4 = 50 + 40 = 90

in doua moduri: 9 x (7 - 3)
modul 1: 9 x (7 - 3) = 9 x 4 = 36
modul 2: 9 x (7 - 3) = 9 x 7 - 9 x 3 = 63 - 27 = 36

in doua moduri: (6 - 5) x 4
modul 1: (6 - 5) x 4 = 1 x 4 = 4
modul 2: (6 - 5) x 4 = 4 x 6 - 4 x 5 = 24 - 20 = 4


b)

in trei moduri: 2 x 3 x 1
modul 1: (2 x 3) x 1 = 6 x 1 = 6
modul 2: 2 x (3 x 1) = 2 x 3 = 6
modul 3: 3 x (2 x 1) = 3 x 2 = 6

in trei moduri: 1 x 4 x 2
modul 1: (1 x 4) x 2 = 4 x 2 = 8
modul 2: 1 x (4 x 2) = 1 x 8 = 8
modul 3: 2 x (4 x 1) = 2 x 4 = 8

in trei moduri: 6 x 0 x 5
modul 1: (6 x 0) x 5 = 0 x 5 = 0
modul 2: 6 x (0 x 5) = 6 x 0 = 0
modul 3: 0 x (6 x 5) = 0 x 30 = 0

in trei moduri: 3 x 2 x 4
modul 1: (3 x 2) x 4 = 6 x 4 = 24
modul 2: 3 x (2 x 4) = 3 x 8 = 24
modul 3: 2 x (3 x 4) = 2 x 12 = 24



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