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a fost răspuns

Determina numarul x ,stiind ca x+2×x+3×x+4×x+5×x+6×x+7×x+8×x+9×x+10×x=385

Răspuns :

CarMina03
x+2×x+3×x+4×x+5×x+6×x+7×x+8×x+9×x+10×x=385
x×(1+2+3+4+5+6+7+8+9+10)=385
1+2+3+4+5+6+7+8+9+10=10×11:2=110:2=55
x×55=385
x=385:55
x=7

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