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题目
there is a piano in the classroom(改为一般疑问句并作否定回答there are some students in the library
there is a piano in the classroom(改为一般疑问句并作否定回答〕there are some students in the library〔改为否定句〕there are —four— basketballs in the box〔对划线部分提问〉

提问时间:2020-06-04

答案
补充一楼第一题!
1.Is there a piano in the classroom?
No,there isn't.
2.There aren't any students in the library.
3.How many basketballs are there in the box?
举一反三
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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