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kungfu00934
2 năm trước
1:1 thửa ruộng hình chữ nhật có chiều dài gấp 3 lần chiều rộng.Nếu kéo dài cả chiều dài và chiều rộng thêm 5m thì diện tích của thửa ruông tăng thêm 145 m2.Tình diện tích thửa ruộng ban đầu. Bài 2 : 1 thư viện trường học có 1 5 15 số sách cho mượn về nhà, còn lại là số sách mượn dọc tại thư viện.Sau khi có thêm 840 cuốn sách nữa thì số sách cho mượn về nhà tăng gấp đôi,còn số sách đọc tại thư viện tăng thêm 1 9 19 (số sách cùng loại đã có).Hỏi lúc đầu có bao nhiêu cuốn sách tại thư viện ? Giúp mình zới!
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