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2 năm trước
Câu 1: So sánh P và Q: P = 2016/2017 + 2017/2018 + 2018/2019 Q = 2016+2017+2018/2017+2018+2019. Câu 2: Tìm x: ( 2,7x - 1 1/2x ) : 2/7 = -21/4 ( 1 1/2 là hỗn số nhân vs x nha, 2,7 là số thập phân )
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