Why did you help him so much?
题目
Why did you help him so much?
改为同义句.
答案
Why do you help him all the time?
Why do you care for him so much?
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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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