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Raulisca1
a fost răspuns

Determina numarul nat. x pt care 7×x+14×x+21×x+28×x+.....+126×x=7×9×19

Răspuns :

Alexmysulica
7×x+14×x+21×x+28×x+.....+126×x=7×9×19
7×x+14×x+21×x+28×x+.....+126×x=1197
(7+14+21+28+....126)xX=1197
7+14+21+28+....126=
S=7+14+21+28+....126
S=126+119=112+105+....+126
2S=133+133+133+133+....133
      cati de 133 avem?
n=(126-7):7+1=119:7+1=17+1=18
2S=18x133|:2
S=9x133
S=1197
1197xX=1197
X=1197:1197
X=0


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