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hoahuynh12062001
2 năm trước
BT1,Có 2 thùng dầu, trung bình mỗi thùng chứa 38 lít dầu. Thùng thứ nhất chở 40 lít. Tính số lít dầu của thùng thứ 2 BT2,Nếu tuổi trung bình của 30 học sinh trong một lớp là 9 tuổi. Nếu tính cả cô giáo chủ nhiệm thì tuổi trung bình của cô và 30 học sinh là 10 tuổi. Hỏi cô giáo chủ nhiệm bao nhiêu tuổi? BT3,Tuổi trung bình của cô giáo chủ nhiệm và 30 học sinh là 12 tuổi. Nếu không kể tuổi của cô giáo chủ nhiệm, thì trung bình cộng tuổi của 30 học sinh là 11 tuổi. Tính tuổi của cô giáo chủ nhiệm MÌNH CẦN GẤP,BẠN NÀO LÀM NHANH MÌNH SẼ ĐÁNH GIÁ 5 SAO,MÌNH CÁM ƠN Ạ!
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