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若直线y=2x+m与圆x2+y2+2x-4y=0相切,则实数m的值为( ) A....
若直线y=2x+m与圆x2+y2+2x-4y=0相切,则实数m的值为( )
A.-1或9
B.0或10
C.2或12
D.3或13
考点分析:
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