A:Scarcely had she fallen tha
B:No sooner did she fall; tha
C:Hardly she had when whe
D:Scarcely had she fallen; whe
在同一平面内,直线a∥c,且直线a到直线c的距离是2;直线b∥c,直线b到直线c的距离为5,则直线a到直线b的距离为( )
已知△ABC的顶点A(3,2),B(4,3),C(2,3),动点P(x,y)在△ABC的内部(包括边界),则yx-1的取值是( )