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Determinati cinci multipli consecutivi ai lui 3. stiind ca suma lor este 780


Răspuns :

3x+3x+3+3x+6+3x+9+3x+12=780
15x=750
x=750/15=80

Multiplii sunt:
240,243,246,249,252

P.S: aceasta ''/'' inseamna supra adica linia de fractie.

Succes :* :)

150;153;156;159;162
3×50;3×51;3×52;3×53;3×54
150+153+156+159+162=780