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設第一次在4點5分左右為4點x分,設第二次在4點44分左右為4點y分.(30/60)*x+120-(360/60)x=90x=60/11[30-(30/60)*y]+6y-180=90y=480/11答:第一次分針垂直於時針是4點60/11分;第二次分針垂直於時針是4點480/11分.不明…
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