five friends met and they shook hands with each other.how many hand shakes took place?
题目
five friends met and they shook hands with each other.how many hand shakes took place?
please write chinese.
答案
5个朋友见面,他们相互握手.问：他们一共握了几次手?（每个人和别人共握手4次,共有五个人,所以是握手20次）
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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