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Descopera regula si completeaza fiecare sir:
a) 1005, 2010,4020,------,-----.
b)400400,200200, 100100, -----,-----.
c) 1000000, 200000,40000, ----,-----.
d) 99,909,9009,-------,------.

Răspuns :

CosmoteRo
a) 8040, 16080
b) 50050, 25025
c) 8000, 1600
d) 99,909,9009,90009,900009
Ariadnaharghel
a)1005,2010,4020,8040,16080.
b)400400,200200,100100,8000,1600.
c)1000000,200000,40000,8000,160.
d)99,909,9009,90009,900009.

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