A:She is wearing black shorts.
B:He is wearing black shorts.
C:He is wearing brown shorts.
若三角形的三边分别是a,b,c,且a-252+a-b-1+c-4=0,则这个三角形的周长是( )
已知点A(x,5)关于点(1,y)的对称点(﹣2,﹣3),则点P(x,y)到原点的距离是( )
直线y=kx+3与圆x-32+y-22=4相交于M,N两点,若MN≥23,则k的取值范围是( )