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a fost răspuns

(3+1x6)+(3+2x6)+...+(3+19x6)=??

Răspuns :

STEFANIASTANESCUGO

3[(1*6)+(2*6)+...+(19*6)]=

3*6(1+2+...+19)=18*190=3420

NEKFEYGO

(3+6)+(3+12)+3+3x18+(3+114)

=9+15+3+54+117

=24+57+117

=81+117

=198