Last week our class had a class meeting.At the meeting,all the students expressed their opinious on
题目
Last week our class had a class meeting.At the meeting,all the students expressed their opinious on
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答案
上周,我们班开了一次班会.会上,所有的学生就.发表了意见.
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已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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