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kien200111222
2 năm trước
Bài 20: Cạnh hình vuông tăng lên 20% thì chu vi hình vuông tăng thêm bao nhiêu phần trăm? Diện tích hình vuông tăng bao nhiêu phần trăm? Bài 21: Một mảnh vườn hình chữ nhật, người ta mở rộng chiều dài 30%, mở rộng chiều rộng 20%. Hỏi diện tích mảnh vường tăn bao nhiêu phần trăm?
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