坐標選擇題同應用題.15分

ying ying

2010-08-11 8:48 pm

應用題
1.己知ABCD為長方形.如ABC分別為(1,1).(1,6)和(3,6).球D的坐標.

2.梯形各頂點的坐標分別為A(-2,-1).B(5,-1)和D(-1,2).球面積.

3.己知A(-5,2)和B(x,-2)之間距離是6單位.B的坐標是否唯一的?簡介你的答案.

選擇題.
4.下列那點不在y軸上?
A (0,-2)
B (0,2)
C (0,0)
D (2,0)

5.下列那點在y軸上?
A (-1,-1)
B (0,-1)
c (-1,0)
d (1,-1)

6.下列那點與(5,2)在同一水平上?
A (6,3)
b (5,0)
C (1,2)
d (-5,-2)

7.下列那點與(-1,3)在同一鉛垂線上?
A (-1,-3)
b (1,3)
C (0,4)
d (1,-3)

8.下列那點與(2,3)之間距離為最近.
A (-2,3)
b　（２,-3)
C (-2,-4)
d (-3,3)

9. 己知(0,0).(4,0)和(0,5)組成一三角形.球面積.

A 4
b 5
C 10
d 20

如A點距離原點5單位.下列那點不可能為A的坐標?
a (5,5)
B (5,0)
c (0,5)
D (-5,0)

更新1:

第2題C係(3,2)

回答 (1)

Godfrey

2010-08-12 7:30 pm

✔ 最佳答案

Question1:D(1, 6), D must have the x-coordinate of point C and the y- coordinate of pointAQuestion2 is incomplete. Point C is missing.Question3:The distance between A an B
= Square root [(x2 –x1)^2 + (y2 – y1)^2)] = 6Square both sides, (x2 –x1)^2 + (y2 – y1)^2 = 6^2(x-(-5))^2+ (2 – (-2))^2 = 36(x+5)^2+ 4^2 = 36(x + 5)^2 + 16 = 36(x + 5)^2 = 20x+ 5 = Sq root (20)x= _-5 +2 sq root(5) or -5 – 2sq root(5)x= -2.764 or -9.472 B的坐標不是唯一的, B(-2.764, -2) or B(-9.472, -2) 選擇題.4.下列那點不在y軸上?D(2,0)5.下列那點在y軸上?B(0,-1)6.下列那點與(5,2)在同一水平上?C(1,2)7.下列那點與(-1,3)在同一鉛垂線上?A(-1,-3)8.下列那點與(2,3)之間距離為最近.A(-2,3)9.己知(0,0).(4,0)和(0,5)組成一三角形.球面積.C1010.如A點距離原點5單位.下列那點不可能為A的坐標 ?A(5,5)

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