问题
选择题
圆(x-1)2+(y-1)2=2被x轴截得的弦长等于( )
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答案
令y=0,可得(x-1)2=1,解得x-1=±1,∴x=2,或x=0.
∴圆(x-1)2+(y-1)2=2被x轴截得的弦长等于2-0=2,
故选C.
圆(x-1)2+(y-1)2=2被x轴截得的弦长等于( )
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令y=0,可得(x-1)2=1,解得x-1=±1,∴x=2,或x=0.
∴圆(x-1)2+(y-1)2=2被x轴截得的弦长等于2-0=2,
故选C.