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thaithanhthao
2 năm trước
Một chiếc ghế có khối lượng 5kg, ghế có bốn chân, tiết diện chân ghế hình vuông cạnh a. Một người có khối lượng 59kg ngồi lên ghế thì áp lực ghế lên mặt sàn nằm ngang là 100000N. Tính a(cm).
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