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1. Một hình tam giác có độ dài đáy là 0,8 m chiều cao bằng 3/4 độ dài đáy Tính diện tích của hình tam giác đó 2. Một thửa ruộng hình tam giác có độ dài đáy là 60 m chiều cao bằng 3/5 độ dài đáy người ta trồng lúa trên thửa ruộng đó trung bình cứ 50 mét vuông thu được 3,5 kg thóc hỏi trên cả thửa ruộng thu được bao nhiêu tạ thóc 3. Cho hình thang có tổng độ dài hai đáy là 5,8 m diện tích là 14,5 mét vuông chiều cao của hình thang là
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