i j k F x dr =|20t” –3t° 5t" 2tdt 2dt 3todt i{(-3t”)(3todt)–(5t")(2dt}+j(5t")(2tdt)–(20t')(3todt)}+k((20t')(2dt)-(–3t”)(2tdt)} i(–9t'—10t")dt ...
確定！ 回上一頁
