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truc209
2 năm trước
Người ta dùng máy nén thủy lực để nâng 1 vật cs thể lượng 12 tấn .pít tông nhỏ cs điện tích 15 cm, pít tông lớn cs tiếp diện tích 500cm vuông .để cs thể nâng vật đó lên thì phải cs tác lực là bao nhiêu? GIÚP MINH Vs ạ///
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