She drinks a lot of waters.
____应改为____
已知函数f(x)=ln(1+x).
(1)若函数g(x)=f(e4x)+ax,且g(x)是偶函数,求a的值;
(2)若h(x)=f(x)f (x)+2m﹣1在区间e﹣1,e3﹣1上有最小值﹣4,求m的值.
如图,矩形ABCD中,E为BC上一点,DF⊥AE于F.
(1)△ABE与△ADF相似吗?请说明理由.
(2)若AB=6,AD=12,BE=8,求DF的长.
时间∕s
0
1
2
3
4
5
n(NO)∕mol
0.020
0.010
0.008
0.007