A:23
B:13
C:22
D:3
生物体内直接提供能量的物质是( )
函数f(x)=axx<0a-3x+4ax≥0满足f(x1)﹣f(x2)(x1﹣x2)<0对定义域中的任意两个不相等的x1,x2都成立,则a的取值范围是____
____ ____ fine day it is! Let's go out for a walk.
-- I heard that there are a few seats left for tonight's show.
-- Really? I was under the impression ______ they were sold out a long time ago.
根据下列表格的对应值,判断ax2+bx+c=0 (a≠0,a,b,c为常数)的一个解x的取值范围是 ____
x
3.23
3.24
3.25
3.26
ax2+bx+c
﹣0.06
﹣0.02
0.03
0.09