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=?