describe a change in your country.It could be a social,political or economical change.
题目
describe a change in your country.It could be a social,political or economical change.
托福口语题,
答案
Personally,I would have to say that the subway,which develops rapidly during the past two decades in my country,is an encouraging change that has a positive influence on social life,and there are a co...
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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.
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