people use knives to cut things?变被动语态(下还有)
题目
people use knives to cut things?变被动语态(下还有)
The students don't clean the classroom in the morning.变被动语态
答案
1 Are knives used (by people) to cutting
2 The classroom isn't cleaned by the students in the morning .
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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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