求雅思大作文写作!Happiness is considered very important in life.Why is it difficult to define?
题目
求雅思大作文写作!Happiness is considered very important in life.Why is it difficult to define?
答案
Happiness is considered very important in life.Why is it difficult to define?What factors are important in achieving happiness?When asked what they are after in their life,people tend to say that happ...
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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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