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determinarea numerelor naturale de forma xybarat, stiind ca x3ybarat + y7xbarat =504

Răspuns :

x * 100 + 30 + y + y * 100 + 70 + x = 504
101*x + 101*y + 100 = 504
101(x + y) = 404
x + y = 4
x = 0;  y = 4
x = 1;  y = 3
x = 2;  y = 2
x = 3;  y = 1
x = 4;  y = 0