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(1,2), (3,1)到直线l的距离分别为1和2,则符合条件的直线条数有( ) A.3B.2 4 1
(1,2)距离为1,且与点 (3,1)距离为2的直线共有A.1条 B.2条 3条 4条
[-3,-1] [-1,3] [-3,1] (-∞,-3]∪[1,+∞)
[-3,-1] [-1,3] [-3,1] (-∞,-3]∪[1,+∞)
[-3,-1] [-1,3] [-3,1] (-∞,-3]∪[1,+∞)
2x﹣3y﹣4=0 2x+3y﹣4=0 3x﹣2y﹣6=0 3x+2y﹣6=0
{﹣3,1,2} {1,2} {﹣3,1} {1,2,3}
(1,2)距离为1,且与点 (3,1)距离为2的直线共有 A.1条 B.2条 3条 4条
2x+y-11=0 x+2y-11=0 x+2y=0 2x+y-1=0
int a[1][4]={1,2,3,4,5}; float a[3][]={{1,2},{2,3},{3,1}}; long a[2][3]={{1},{1,2},{1,2,3},{0,0}}; double a[][3]={8};
y=2x+4 y=﹣3 x﹣2y﹣1=0 3x+y+1=0