mình có câu hỏi đây:
29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29+29-29-29+123=?
dap an = 123
vì ta gop (29-29) thì = 0