A:(x﹣2)2+(y﹣3)2=4
B:(x+2)2+(y﹣3)2=4
C:(x+2)2+(y+3)2=4
D:(x﹣2)2+(y+3)2=4
说一说:你在教室里坐在第几大组,第几小组?第几排?
—Rarely, believe it or not, ________ him behave well in class.
已知函数f(x)=log22-x,0≤x<kx3-3x2+3,k≤x≤a,若存在实数k使得函数f(x)的值域为﹣1,1,则实数a的取值范围是____