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a+b+c=7
Trebuie sa aflu ax13+bx13+cx13+21
Plss urgent dau coroana


Răspuns :

a+b+c=7
a×13+b×13+c×13+21 =(a+b+c)×13+21=7×13+21=91+21=112
a+b+c = 7
a×13+b×13+c×13+21
dam factor comun pe 13
13×(a+b+c)+21 =
= 13×7+21 =
= 91+21 =
= 112