Bài 4. .Một khu vườn hình chữ nhật có chiều rộng bằng chiều dài và có chu vi bằng 180m. a/ Gọi chiều dài quãng đường là x (m) ( x>0), hãy biểu diễn chiều rộng theo x? b/ Vì chu vi của khu vườn bằng 180 m nên ta có phương trình nào? c/ Giải phương trình ở phần b để tìm được chiều dài của khu vườn. Từ đó hãy tính diện tích của khu vườn.

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