两辆汽车同时从A、B两地相对开出,甲车每小时行72千米,乙车每小时行60千米.两车相遇后,甲车继续行驶5小时才到达B地.A、B两地相距多少千米?
题目
两辆汽车同时从A、B两地相对开出,甲车每小时行72千米,乙车每小时行60千米.两车相遇后,甲车继续行驶5小时才到达B地.A、B两地相距多少千米?
答案
72*（72*5/60+5）=792
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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