Bài 1: Một người đi từ đi từ A đến B gồm một đoạn lên dốc 2730m, một đoạn nằm ngang dài hơn đoạn lên dốc 1370m, một đoạn xuống dốc ngắn hơn đoạn nằm ngang 1km. Hỏi độ dài đoạn đường từ A đến B? Bài 2:Cho một hình chữ nhật, nếu ta giảm chiều dài 5cm và tăng chiều rộng 5cm thì được một hình vuông có chu vi là 36cm. Tính diện tích hình chữ nhật đó.

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