慧眼识错 They havent already comeback 改错 She has lost her bike two years ago 改错
题目
慧眼识错 They havent already comeback 改错 She has lost her bike two years ago 改错
慧眼识错
They havent already comeback 改错
She has lost her bike two years ago 改错
We have lived here for 1985改错
My brother has finished his homework yet改错
答案
They haven't come back yet.
She lost her bike two years ago.
We have lived here since 1985.
My brother has finished his homework already.
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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