Răspuns :
x + 2*x + x/3 + 9 =9999 | *3
3x + 6x + x + 27 = 29997
10x = 29997-27
10x = 29970
x = 29970 : 10 = 2997
R. x = 2997
Proba: 2997 + 2*2997 + 2997:3 + 9 =
2997 + 5994 + 999 + 9 = 9999 (A)
3x + 6x + x + 27 = 29997
10x = 29997-27
10x = 29970
x = 29970 : 10 = 2997
R. x = 2997
Proba: 2997 + 2*2997 + 2997:3 + 9 =
2997 + 5994 + 999 + 9 = 9999 (A)
cel mai mare nr 4cifre este 9.999.
9.999-9=9.990
9.990:3=3.330
3.330:2=1.665(nr.)
9.999-9=9.990
9.990:3=3.330
3.330:2=1.665(nr.)