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Andrey13032006
a fost răspuns

Cât ne dă 7.x+14.x+21.x+28.x+...+126.x=7.9.19?

Răspuns :

HawkEyed
7x ( 1+2+3+4+....+18) = 7*9*19 
7x * 18 * 19 : 2 = 7 * 9 * 19 
7x * 9 * 19 = 7 * 9 * 19 
x = 1 
Didi12342
7X + 14X + 21X + 28X+...+ 126X = 7×9×19

7X+2×7X+3×7X+4×7X+...+18×7X = 7×9×19

7X(1 + 2 + 3 + 4 +...+18) = 7 × 9 × 19

7X × 18 × 19 : 2 = 7 × 9 × 19

7X × 9 × 19 = 7 × 9 × 19

X = (7×9×19) : (7×9×19)

X = 1

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