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Descopera regula si completeaza fiecare sir.
a) 855, 1005, 1155, ...., ...., ....
b)10000, 9200, 8400, ...., ...., ....
c) ...., ...., 3000, 4500, 6000, ...., ....
d)...., ...., 5000, 3750, 2500, ...., ....


Răspuns :

a) 855, 1005, 1155, 1305, 1455, 1605
b) 10000, 9200, 8400, 7600, 6800, 6000
c) 0, 1500, 3000, 4500, 6000, 7500, 9000
d) 7500, 6250, 5000, 3750, 2500, 1250, 0
a) 1155+150=1305, 1305+150= 1455, 1455+150=1605
b) 8400-800=7600, 6800, 6000
c) 3000-1500= 1500
si vine 0, 1500, 3000, 4500, 6000, 7500, 9000
d) 5000+1250= 6250+1250= 8000
si vine 8000, 6250, 5000, 3750, 2500, 1250, 0.
Coroana?