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aflati numarul natural x daca ;3+6+9+..........+297 =150x

Răspuns :

Laura27
3+6+9+...+297=150x
S=3+6+9+...297
S=300*(294:3+1)
S=300*(98+1)
S=300*99
S=29700
Deci 29700=150x=>x=29700:150=>x=198

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