Câu trả lời:
nguuuuuuuuuuuuuuuuuuuuuuuuuuuuu
nguuuuuuuuuuuuuuuuuuuuuuuuuuuuu
tại sao S1+S2+S3+S4+....+S8=90
cho hỏi cái khúc cuối 24m ở đau ra dị
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phải tính Uad chứ