英语作文：低碳环保
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英语作文：低碳环保
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My low carbon lifeThe earth is our home, protect the earth is our duty, advocate low carbon life has become one of the ways we protect the earth, it is also a responsibility of a primary school studen...
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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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