命题“若x2+y2=0,则x,y全为0”的否命题是( )
A.若x2+y2≠0,则x,y全不为0. | B.若x2+y2≠0,则x,y不全为0. |
C.若x2+y2≠0,则x,y至少有一个为0. | D.若x,y不全为0,则x2+y2≠0. |
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命题“若x2+y2=0,则x,y全为0”的否命题是( )
A.若x2+y2≠0,则x,y全不为0. | B.若x2+y2≠0,则x,y不全为0. |
C.若x2+y2≠0,则x,y至少有一个为0. | D.若x,y不全为0,则x2+y2≠0. |