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You__yesterday if you were really serious about the job.
ought to have done表示“过去该做而没做的事”。新版章节练习,考前压卷,完整优质题库+考生笔记分享,实时更新,用软件考,
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.