Grupeaza termenii in mod diferit si rezolva in trei moduri exercitiile

Rezolvare


a)
2 x 3 x 1 = (2 x 3) x 1 = 6 x 1 = 6
2 x 3 x 1 = 2 x (3 x 1) = 2 x 3 = 6
2 x 3 x 1 = 3 x (2 x 1) = 3 x 2 = 6

b)
4 x 2 x 3 = (4 x 2) x 3 = 8 x 3 = 24
4 x 2 x 3 = 4 x (2 x 3) = 4 x 6 = 24
4 x 2 x 3 = 2 x (3 x 4) = 2 x 12 = 24

c)
3 x 3 x 9 = (3 x 3) x 9 = 9 x 9 = 81
3 x 3 x 9 = 3 x (3 x 9) = 3 x 27 = 81
3 x 3 x 9 = (3 x 9) x 3 = 27 x 3 = 81

d)
2 x 2 x 5 = (2 x 2) x 5 = 4 x 5 = 20
2 x 2 x 5 = 2 x (2 x 5) = 2 x 10 = 20
2 x 2 x 5 = (2 x 5) x 2 = 10 x 2 = 20

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