Question

Aflati cifrele x si y stiind media aritmetica a numerelor xx,yy,xyx,și xyyx este 2799. .

Answer 1

Răspuns:

SCZ dar sunt incepatoR

IMI CER SCZ CA NU AM RASPUNS

Answer 2

Răspuns:

x = 9; y = 9

Explicație pas cu pas:

$m_{a} = \dfrac{10x + x + 10y + y + 100x + 10y + x + 1000x + 100y + 10y + x}{4}$

$\dfrac{1113x + 131y}{4} = 2799$

$1113x + 131y = 11196$

$1 \leqslant y \leqslant 9 \implies 131 \leqslant y \leqslant 1179$

$10017 \leqslant 1113x \leqslant 11065$

$\dfrac{10017}{1113} \leqslant x \leqslant \dfrac{11065}{1113}$

$9 \leqslant x \leqslant 9\dfrac{1048}{1113} \implies \bf x = 9$

$131y = 11196 - 1113 \times 9 = 11196 - 10017 = 1179$

$y = 1179 : 131 \implies \bf y = 9$