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lehaquynhtrang2102
2 năm trước
Một tờgiấy hình chữnhật có chiều dài là80cm và bằng 516chu vi tờgiấyđó.a.Tính chiều rộngtờgiấy.b.Người ta dựđịnh bớt lại mỗi bên 5cm đểlàm viền khung, phần còn lại đểvẽtranh như hình vẽ. Hỏi diện tích dùng đểvẽtranh chiếmbao nhiêuphần trăm diện tích tờgiấy?
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