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dothanhtungtung
2 năm trước
Bài 1.Tìm x biết: a) 2x + 36 : 12 = 53 b) | x + 7 | = | -15| c) 19 – | x – 1 | = 4 Bài 2. Một đội thiếu niên có 90 nam và 84 nữ, được chia thành từng tổ sao cho số nam và nữ được chia đều vào các tổ. Hỏi có thể chia nhiều nhất bao nhiêu tổ? Khi đó mỗi tổ bao nhiêu nam, bao nhiêu nữ? Bài 3 Trên tia Ox lấy hai điểm M, N sao cho OM = 4 cm, ON = 7 cm. Gọi I là trung điểm của đoạn thẳng OM. Tính độ dài các đoạn thẳng MN, IN. Bài 4. Thực hiện phép tính: a) 25 –[ 50 – ( 2^3 . 17 – 2^3 . 14 )] b) |-128| : [ 45^2 – ( 2010 – 2008^0 . 1^2010 )]
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