Question

Aflati numerele de forma 4x67y2, daca suma cifrelor sale este 23.

Answer 1

4+x+6+7+y+2=23⇒19+x+y=23⇒x,y∈[[0,4],[4,0],[1,3],[3,1],[2,2]]⇔5 variante de raspuns;
⇒numerele gasite sunt:406742,446702,416732,436712,426722;

Answer 2

4 + x + 6 + 7 + y + 2 = 23
x + y = 23 - 4 - 6 - 7 - 2
x + y = 4
4 = 1 + 3  x = 1 , y = 3     416732
4 = 2 + 2  x = 2 , y = 2      426722
4 = 3 + 1  x = 3  y = 1      436712
4 = 4 + 0  x = 4  y = 0       446702
4 = 0 + 4   x = 0  y = 4      406742