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As the journey was a long one, he took a friend with him for ____.( )
题干的意思是“因为旅途很长,所以他带着一个朋友作伴”,for company,陪伴。
给定曲线y=x3与直线y=px-q(其中p>0),求P与q为何关系时,直线y=px-q是y=x3的切线.
y”-2y′-3y=O的通解是.
yInxdx+xInydy=0的通解是.