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vanpig212
2 năm trước
C1.một vườn hoa hình chữ nhật có chu vi 38 4 m; chiều rộng bằng chiều dài. tính diện tích mảnh vườn đó? C2. Một hình tam giác có chiều cao 8,4 m và bằng 70% độ dài đáy. Tính diện tích tam giác đó. C3. Một cửa hàng lương thực bán được 390 kg gạo bằng 65% tổng số gạo cửa hàng đó có trước khi bán. Hỏi trước khi bán cửa hàng đó có bao nhiều tạ gạo C4 Một hình tam giác có chiều cao 7,5 dm và có diện tích 40,5 dm². Tính độ dài đáy của hình tam giác đó.
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