SADI Muslihuddin Abumuhammad Abdulloh ibni Mushrifuddin (1203/8, Sheroz—1292, hamon jo), shoir, nasrnavis va mutafakkiri fors-tojik. …
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SURAT (arabi -zudi, tezi yake az mafhumhoi asosii mekhanika buda, harakati nuqta (jism)-ro tavsif medihad. Hengomi muntazam harakat kardani nuqta Surati on ba nisbati darozii rohi tayshuda s bar fosilai vaqt t barobar ast, yane: = s/t . Umuman dv =ds/dt ast.
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