how can we live a stress-free life英语作文一篇
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how can we live a stress-free life英语作文一篇
答案
Stress is the result of the building up of depressing thoughts,and it is also the storing up of worries.Everyone have their worries,mainly financial ones,why?Because no one obeyed the golden rule abou...
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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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