—Sorry, my Maths is poor. You can ask Jim. He is good at it.
A:is well at
B:takes part in
C:does well in
分式x-32x+2,2xx-2x+1的最简公分母是( )
将一组数据中的每一个数减去40后,所得新的一组数据的平均数是2,则原来那组数据的平均数是( )