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determina numărul natural x pentru care 7 *x + 14 *x + 21*x+28*x*.....+12+126*x=7*9*19

Răspuns :

7·X+14·X+21·X+38·X+...+126·X=7·9·19
7X·(1+2+3+4+...+18)=7·9·19
7X·18·19:2=7·9·19
X=(7·9·19):(7·9·19)
X=1
7·X+14·X+21·X+38·X+...+126·X=7·9·19
7X·(1+2+3+4+...+18)=7·9·19
7X·18·19:2=7·9·19
X=(7·9·19):(7·9·19)
X=1