Nhà bác Hai có một mảnh đất hình tam giác có độ dài đáy là 75 m, chiều cao hơn đáy 5 m. A) Tính diện tích mảnh đất đó ? B) Trong mảnh đất đó , bác đã dùng 1/5 diện tích đất để trồng rau , phần đất còn lại để trồng cây ăn quả . Hỏi diện tích đất trồng rau chiếm bao nhiêu phần trăm? C) Nay muốn mở rộng thêm mảnh đất bác đã mua thêm diện tích bằng 62,5 phần trăm diện tích đất trồng cây ăn quả . Hỏi diện tích đất bác Hai mua thêm là bao nhiêu mét vuông ?

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