Ta có: ( x -3) + ( x -2) + ( x - 1) + ... + 10 + 11= 11
=> ( x -3) + ( x -2) + ( x - 1) + ... + 10 = 0
=>[(x -3 ) + 10] + [(x - 2) + 9) + ...... = 0
=> x - 3 = -10
=> x = -7
(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
