Bài 1:Tính giá trị của biểu thức: A = x^2-4x+4 tại x=-8 Bài 2: Tìm giá trị nhỏ nhất của biểu thức: C = x2 – 2x + 5 Bài 3: Hiện nay tổng tuổi của bạn Hoa và mẹ bạn Hoa là 51 tuổi. Mười lăm năm sau bạn Hoa lấy chồng, khi bạn Hoa lấy chồng thì tuổi của bạn Hoa bằng một nữa tuổi của mẹ. Hỏi hiện nay bạn Hoa bao nhiêu tuổi?

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