题目内容
圆x2+y2-4x=0在点处的切线方程为
圆x2+y2-4x=0在点P(1,)处的切线方程为
x+y-2=0
x+y-4=0
x-y+4=0
x-y+2=0
A.x+y-2=0
B.x+y-4=0
C.x-y+4=0
D.x-y+2=0
A.
B.
C.
D.