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obsevati regula de formare si continuati scrierea sirului de numere :
a)15;17;19;. . . ;33
b) 3; 6 ; 9; . . . ; 27
c) 5; 10 ; 20; 25; 35; . . . 65
d) 1; 5; 2; 10; 3; 15; . . . ;55
e) 8; 9; 12; 13; 16; 17; . . . ;32
f) 33; 31; 29;. . . 
g) 65; 55; 50; 40; . . .

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Răspuns :

15,17,19,21,23,25,27,29,31,33
3,6,9,12,15,18,21,24,,27
5,10,20,25,35,40,50,55,65
1,5,2,10,3,15,4,20,5,25,6,30,7,35,8,40,9,45,10,50,11,55
8,9,12,13,16,17,20,21,24,25,28,29,32
33,31,29,27,25,23,21,19,17,15,13,11,9,7,5,3,1
65,55,50,40,35,25,20,10,5
Alinavina
a) 15 ,17 ,19,21,23,25,27,29,31,33 b)3, 6 ,9, 12 15, 18,21, 24,27c)5 10 15 20 25 30 35 40 45 50 55 60 65 d)1 5 2 10 3 15 4 20 5 25 6 30 7 35 8 40 9 45 10 50 11 55 e) 8 9 12 13 16 17 20 21 24 25 28 29  32  f)33 31 29 27 25 23 21 g) 65 55 50 40 35 25 20 10

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