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ݷʱ : 2024/12/26 2:37:14һ µȫĶ

6֪P2-1

1PԭΪ2ֱlķ̣

2Pԭֱlķ̣Ƕ٣

3ǷڹPԭΪ6ֱߣڣ̣ڣ˵ɡ

˼·ֱ߷?ɵ㵽ֱ߾?жϺʱȡֵ֮

(Գ ٵֱߵĶԳ

еڶԳlϣ

ֱlAx+By+C=0Գƣ߶εֱߴֱڶԳlϣɷ

ɵõ

P1lԳƵĵ

P2

?x2,y2?A?0,x1?x2

ֱ߹ֱߵĶԳ

һתΪֱߵĶԳһֱ֪Գཻ

ֱ֪ԳƽС

7ֱl1:y?2x?3ֱl:y?x?1ԳƵֱl2ķ̡ ˼·תΪֱߵĶԳ⣬÷⡣ ϰ

1㣨10ֱx-2y-2=0ƽеֱ߷ǣ

Ax-2y-1=0 (B)x-2y+1=0 (C)2x+y-2=0 Dx+2y-1=0

2ԲC:x?y?2x?4y?4?0Բĵֱ3x?4y?4?0ľd?

3֪ԲC㣨10Բxϣֱl:y?x?1ԲCصõҳΪ22ԲֱlֱֱߵķΪ

4бΪ45?yϵĽؾΪ?1ֱ߷ǣ

Ax?y?1?0 Bx?y?1?0 Cx?y?1?0 Dx?y?1?0 5

22M?2,1?ֱlxᡢyֱPQ㣬

MQ?2MP

ֱlķΪ

A.x+2y-4=0 B.x-2y=0 C.x-y-1=0 D.x+y-3=0

6֪A(?2,m)B(m,4)ֱֱ2x?y?1?0ƽУmֵΪ A. 0 B. ?8 C. 2 D. 10

7֪ab?0,bc?0ֱax?by?cͨ A. һ B. һ C. һ D. ڶ

8(2m?m?3)x?(m?m)y?4m?1?0ʾһֱߣʵm㣨 A. m?0 C. m?1

2xy?e9ͼϵĵ㵽ֱ2x?y?4?0Сֵ _

22B. m??3 2

D. m?1m??3m?0 2

10 ֱ

11һߴӵA(1,3)xᣬxϵĵPͨB(3,1)P꣮

12.дֱߵĵбʽ̣

(1)A(2,5)ֱy2x7ƽУ (2)C(11)xƽУ

l1:mx?y?1?0

l2:x?2y?5?0ֱmֵ

13.ABCֱΪA(0,4)B(2,6)C(8,0) (1)ACABֱߵķ̣

(2)ACϵBDֱߵķ̣ (3)ACϵдֱߵķ̣

14.ֱ֪l1(m3)xy3m40l27x(5m)y80ʵmΪֵʱֱl1l2ƽ