(x+1)+(x+3)+...+(x+99)=0
(x-3)+(x+2)+(x-1)+....+10+11=11
(x-3)+(x-2)+(x-1)+.....................................................+10+11=11
(x-3)+(x-2)+(x-1)+...10+11=11
(x-3)+(x-2)+(x-1)+...+10+11=11
(x-3)+(x-2)+(x-1)+........+10+11=11
(x-3)+(x-2)+(x-1)+...+10+11=11
Tìm x biết x-3+x-2+x-1+x...+10+11=11
Tim x biet (x-3) + (x-2) + (x-1) + ... + 10 + 11 = 11
d) (x-3)+(x-2)+(x-1)+......+10+11=11
