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S=6+12+18+...+120
formula lui gauss


Răspuns :

Răspuns:

S= 6 × (1+2+3+....+20)

S=6 × 20×21÷2

S=6×10×21

S=60×21

S=1260

Răspuns:

6+12+18+......+120=6*(1+2+3+.......+20)

=6*(20x21:2)

=6*(10*21)

=6*210

=1260