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直线(1+a)x+y+1=0与圆x2+y2-2x=0相切,则a的值为A.-1B.-2C.1...
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直线(1+a)x+y+1=0与圆x
2+y
2-2x=0相切,则a的值为( )
A.-1
B.-2
C.1
D.
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