—What color is it?
—_________ [ ]
A. G-R-E-E-N
B. That's a ruler.
C. It's green.
答案:C
一个数取它的近似值后,比原数小.______.
已知函数f(x)=ax2+(a-2)x+b定义域为(b,a-1)是偶函数,则函数f(x)的值域为______.