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determina nr natural c stiind ca x+2×x+3×x+.... +10×x=385

Răspuns :

x+2x+3x+...+10x=385
x(1+2+3+..+10)=385
x(10*11:2)=385
x(5*11)=385
x*55=385
x=385:55
x=7

Sper ca te-am ajutat!