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X+y+z=17
13•x+13•y+13•z-1313


Răspuns :

x+y+z=17
⇒13[x+y+z]=13·17=221;
⇒221-1313
⇒-1092∈Z[multimea numerelor intregi];
x+y+z=17
13x+13y+13z=13
Adica 13(x+y+z)=13 * 17 = 221
221-1313
Deci - 1092
1092 coincide Z