Răspuns :
(-17)^2=17^2=289;
(-15)^2=15^2=225;
(-17)^2 +(-15)^2=289+225=514;
D45€Z;
D45={-45;-15; -9;-5;-3;-1;1;3;5;9;15;45};
-45+(-15)+(-9)+(-5)+(-3)+(-1)+1+3+5+9+15+45=0
(-15)^2=15^2=225;
(-17)^2 +(-15)^2=289+225=514;
D45€Z;
D45={-45;-15; -9;-5;-3;-1;1;3;5;9;15;45};
-45+(-15)+(-9)+(-5)+(-3)+(-1)+1+3+5+9+15+45=0
(-17)² + (-15)² =289+225=514 ;
D₄₅ = {-45;-15;-9;-5;-3;-1;1;3;5;9;15;45}
suma D₄₅ = ... = 0
D₄₅ = {-45;-15;-9;-5;-3;-1;1;3;5;9;15;45}
suma D₄₅ = ... = 0