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khanhquynhmt1
2 năm trước
1) Một hình thoi có diện tích bằng một nửa diện tích hình vuông có cạnh bằng cạnh của hình thoi. Tỉ số của đường chéo dài và đường chéo ngắn của hình thoi là? 2) Hình chữ nhật ABCD có chu vi là 70m. Đường phân giác góc A cắt DC tại E. Chu vi hình thang ABCE lớn hơn chu vi tam giác ADE là 30m. Tính tỉ số chiều rộng và chiều dài của hình chữ nhật đó. Xin chỉ giáo mấy bài này ạ. Em sẽ+5sao để hậu tạ a~
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