题目
托福口语求思路,请用英文表达
Some people like to buy new and expensive books while others prefer to buy old and cheap ones.Which would you prefer?
Some people like to buy new and expensive books while others prefer to buy old and cheap ones.Which would you prefer?
提问时间:2021-03-20
答案
新书理由:a) guarantee a better quality of reading b) able to get access to the newest books[dont have to wait for a discount or the cheaper second-hand copy] c) knowing it's completely brand new and c...
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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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