2.What ______you _____when I called you last night?A.were ,doing B.did,do C.is ,doing D.do,
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2.What ______you _____when I called you last night?A.were ,doing B.did,do C.is ,doing D.do,
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举一反三
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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