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3^1+3^2+3^3+.........+3^27 repede va rog!!!

^=la li


Răspuns :

3*(1+2+3+.........+27) =
1+2+3+......+27=
27*(27+1) : 2
27*28=756
756: 2=378

3^1+3^2+3^3+........+3^27=378
3*1+3*2+3*3+......3*27=?
3(1+2+3+...+27)
3*[(27*28):2]
3*378=1134