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determina numarul natural x,stiind ca x+2xX+3xX+...........+10xX=385

Răspuns :

x+2x+3x+...+10x=385
(10×11:2)x=385
55x=385=>x=7
x+2×x+...+10×x=385
Dam factor comun x=>
=> x×(1+2+...+10)=385
x×55=385 => x=7

Sper ca te-am ajutat!!