A:x≤﹣2
B:x>3
C:3<x≤﹣2
D:无解
计算 3a2的结果是( )
点M(x0,y0)在圆x2+y2=R2外,则直线x0x+y0y=R2与圆的位置关系是( )
—It's ____. What do you need? —I need a____.