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2 năm trước
An có một thửa ruộng hình tam giác vuông ABC. vuông góc tại A Cạnh AB dài 40m. Cạnh AC dài 60m. An cắt ra 1 mảnh hình thang vuông AMNC có đáy lớn là cạnh AC của thửa ruộng và chiều cao 10m để gieo mạ. Tính diện tích còn lại?
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