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pttphuong231
2 năm trước
1. Tính giá trị biểu thức sau: -1+3+5+...+_299+301 b, Cho biểu thức sau: S= 0,75++1,25+...+10,5. - Tổng trên có bao nhiêu số hạng - Số 7 là số hạng bao nhiêu trong biểu thức - Số hạng thứ 18 là bao nhiêu
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