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duanphongtho2009
2 năm trước
Hình bên đc tạo bởi một hình chữ nhật ( có chiều dài là 60cm, chiều rộng 40 cm) và hai nửa hình tròn( xem hình chụp. Hỏi: tính chứ vì , diện tích hình đó Cảm ơn trc ad cho 20 điểm
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