Mary often helps her mother do some housework.
题目
Mary often helps her mother do some housework.
保持原局意思
Mary____ ____ _____mother____housework.
答案
mary often helps her mother with housework
---help sb with sth
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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