Bài 1 :Tính biểu thức sau bằng cách thuận tiện nhất : a. (6 x 8 – 48) : (10 + 11 + 12 + 13 + 14 + 15) b. 32764 - 2467 + 236 + 3467 Bài 2: Tìm: 72 - x : 4 = 16 72 : x – 3 = 5 Bài 3: Tính nhanh: a, 45 x 5 + 45 x 4 + 45 b, 18 x 7 + 18 x 16 – 18 x 14 + 18 c, 25 x 18 x 4 x 2 Bài 4: An nghĩ một số. Nếu gấp số đó lên 3 lần rồi cộng với 15 thì được 90. Tìm số An đã nghĩ. Bài 5: Một cửa hàng cây cảnh có 48 cây quất. Sau một ngày bán chỉ còn lại \frac{1}{6} số cây quất. Hỏi: a) Cửa hàng còn lại bao nhiêu cây quất? b) Đã bán bao nhiêu cây quất?

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