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一、选择题(12个小题,每小题5分,共60分,每小题给出的四个选项中,只有一项是符合题目要求的) (1)设点P在过点O(0,0)和A(6,3)的直线上,且OP:PA=1:2,又P是线段AB的中点,则点B的坐标是 ( ). A.(2,4) B.(4,2) C.(-1,-2) D.(-2,-1) (2)a=3是直线ax+2y+3a=0与直线3x+(a-1)y=a-7平行且不重合的( )条件. A.充分非必要 B.必要非充分
First, multiple-choice questions (12 questions, 5 points for each question, a total of 60 points, each of the four options given in the question, only one is in line with the requirements of the title) (1) set point P in the point O On the straight line of (0,0) and A(6,3), and OP:PA=1:2, and P is the midpoint of the line segment AB, then the coordinate of point B is (). A.(2,4) B.(4,2) C.(-1,-2) D.(-2,-1) (2)a=3 is the line ax+2y+3a=0 and the line 3x+(a-1)y= A-7 parallel and not coincident () conditions. A. sufficiently non-essential B. necessary not sufficient