a) – 5 < x < 4
x∈{-4;-3;-2;-1;0;1;2;3}\
=> tổng :-4-3...+2+3=-4;
.
b) – 5 ≤ x ≤ 5
x∈{-5;-4;...3;4;5};
=> tổng :-5-4-3...+4+5=0;
.
c) – 15 ≤ x < 20;
x∈{-15;-14;...19};
=> tổng :-15-14...+19=70;
.
d) -24 < x ≤ 18;
x∈{-23;-22;...17;18};
=> tổng :-23;-22...+17+18=-105;
.
e) – 17 < x < 0;
x∈{-16;-15;...-1};
=> tổng :-16-15...-1=-136;
.
g) – 20 ≤ x < 21
x∈{-20;-19;...20}
=> tổng :-20-19....+20=0