由y=x2-1x2+1,得x2=y+11-y.
∵x2≥0,∴y+11-y≥0,解得-1≤y<1.
故答案为:[-1,1).
关系数据醋的数据结构是怎样的?它对关系有什么要求?
Be careful! There's some broken glass on the ground. The underlined part means " ______ ". [ ]
A. Look out
B. Go ahead
C. Get ready
D. Keep quiet