短文改错,每个都要说明原因、谢谢
题目
短文改错,每个都要说明原因、谢谢
Behind my apartment,there is used to be a dirty and messy comer.Bits of plastic bags hanged on the trees.Broken bottles were left laying here and there.There was a damaging car in the center.The whole comer gave off an unpleasant smell.One year ago,we decided to turn it in a beautiful park.Since then,great changes have been cleared away.Flowers and young trees have planted all over.Now birds come here to sing,children come here to play,and adults come here to enjoy our peaceful life.It has taken on a new look.
答案
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.
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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