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MonykaMonMon
a fost răspuns

Determina numărul natural X, știind ca X+2×X+3×X+......+10×X=385 . PLZ PLZ PLZ PLZ PLZ PLZ PLZ PLZ PLZ PLZ PLZ PLZ PLZ PLZ PLZ PLZ PLZ

Răspuns :

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