A. He's cleaning the room.
B. Thank you.
C. Sorry,I can't.
D. Yes,you are.
E. She's at the supermarket.
一堆货物,用载重量6吨的卡车运,8次可以运完.如果改用载重量为4000千克的卡车运,需要多少次才能运完?
观察并分析种子结构的概念图,完成下面的小题:
x÷2.6=0.35
x=____
设函数f(x)=x2﹣mlnx,h(x)=x2﹣x+a
(1)当a=0,f(x)≥h(x)在(1,+∞)上恒成立,求实数m的取值范围;
(2)当m=2时,若函数k(x)=f(x)﹣h(x)在1,3上恰有两个不同的零点,求实数a的取值范围.