直线l经过两点A(m，3)、B(1，2)，请求出直线l的斜率k._爱下问搜题

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问题解答题

直线l经过两点A(m，3)、B(1，2)，请求出直线l的斜率k.

答案

若m=1，则直线AB垂直于x轴，故直线没有斜率；

若m≠1，则直线的斜率为.

对m的值进行讨论.

完形填空

完型填空。
     Look at the boy. He is __1__ good friend. He is __2__ American boy. __3__ name is Tom. __4 _
12. My  _5_  is Wang Lei. __6__ a Chinese boy. I'm 13.
     Tom _ 7__ a small sports collection. He has __8__ tennis racket, three basketballs and four soccer
balls, But I only have __9__ baseball. Tom and I _ 10__ sports every Sunday .

( ) 1. A. I
( ) 2. A. a
( ) 3. A. His
( ) 4. A. She
( ) 5. A. name
( ) 6. A. I
( ) 7. A. have
( ) 8. A. one
( ) 9. A. a
( ) 10. A. plays

B. You
B. an
B. She
B. She's
B. book
B. I'm
B. has
B. two
B. two
B. play

C. me
C. the
C. Her
C. He's
C. friend
C. She
C. doesn't have
C. three
C. three
C. playing

D. my
D. /
D. She's
D. His
D. bag
D. She's
D. doesn't has
D. four
D. four
D. to play

多项选择题

BD之眼炎表现正确的是（）

A.男性合并眼炎的明显多于女性

B.最常见的眼部病变是视网膜炎

C.出现眼炎4年后80％以上患者都有严重的视力障碍

D.眼炎的反复发作可造成严重的视力障碍

E.眼炎可先后累及双侧