Tìm x, biết (x + 1) + (x + 2) + (x + 3) + ... + (x + 99) = 0.
Tìm x, biết (x + 1) + (x + 2) + (x + 3) + ... + (x + 99) = 0.
(x + 1) + (x + 2) + (x + 3) + ... + (x + 99) = 0
(x + x + x + ... + x) + (1 + 2 + 3 + ... + 99) = 0
99x + 4950 = 0
99x = – 4950
x = – 4950 : 99
x = – 50.
Vậy x = – 50.