在一次实验中,因测量误差使得三次实验所测的数据按从小到大排列依次为a1,a2,a3, 我们规定该实验的最佳实验数据a是这样-一个数值,a与各数据a1, a2, a3,差的平方和p最小,依此规定,则a为( )。
A. (a1 + a2+a3)/3
B. (a12 + a22+a32)/3
C. a2
D. p
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已知f(x)是定义在R.上的偶函数,且f(x+1)=-f(x-1),f(-2)=3, 则f(322)的值等于( )。
A. -1
B. 2
C. 1
D. 3
10.若函数f(x)=x(x+a)为偶函数,则a=( )
It is reported that a project to build the longest bridge in the world is ____ these days.
A. on the way
B. in this way
C. under way
D. get in the way
At last, excited and surprised, he founded a ____treasure in the cave.
A. price
B. priced
C. low-priced
D. priceless