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tunganhbui24
2 năm trước
một thửa ruộng hình chữ nhât có chi vi là 360m. Chiều dài hơn chiều rộng là 20m . a/tính diện tích thửa ruộng b/giữa thửa ruông đào một cái ao có chu vi 60m , tính diện tích mặt ao
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