a+a2-6a+9=3,
则a+|a-3|=3,
只有当a≤3时,a+3-a=3,
故a的取值范围是a≤3.
The building _____ in our school is for us teachers. Though there’s noise most of day, we still feel happy about it .
A.built
B.has been built
C.being built
D.to be built
已知正方形ABCD四条边与圆O内切,而正方形EFGH是圆O的内接正方形。已知正方形ABCD的面积为1,则正方形EFGH的面积是( )。
(E)