坐標(兩點之間距離)Distance between poins

2007-07-18 11:22 pm
X (-1,-2 )
Y (-1,y )
Z ( z,-2 )

1.) XY=3,求「y」
2.) XZ=5,求「z」

p.s.出自天風升中預習p.46

回答 (2)

2007-07-18 11:59 pm
✔ 最佳答案
X(-1,2)
Y(-1,y)
Z(z,-2)

XY=3
[(-1)-(-1)]^2+[(-2)-(y)]^2=3^2 (pyth. thm)
-2-y=3 or -2-y=-3
y=-5 or 1

XZ=5
[(-1)-(y)]^2+[(-2)-(-2)]^2=5^2 (pyth. thm)
-1-y=-5 or -1-y=5
y=4 or -6

2007-07-18 16:05:47 補充:
XZ=5[(-1)-(y)]^2+[(-2)-(-2)]^2=5^2 (pyth. thm)-1-y=-5 or -1-y=5y=4 or -6 個y轉做z
參考: 自己
2007-07-18 11:50 pm
不知道................................................


收錄日期: 2021-04-13 13:10:21
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070718000051KK02650

檢視 Wayback Machine 備份