在下列各題中,P(x,y)按指定的比內分線段AB,求其坐標
(a) A(1,2)，B(-2,8)；1：2
(b) A(-3,-4)，B(2,6)；2：3
坐標幾何 唔識計
2007-08-16 9:48 pm
回答 (2)
2007-08-16 10:00 pm
✔ 最佳答案
(a)x=[1(-2)+2(1)]/(1+2)=0
y=[1(8)+2(2)]/(1+2)=4
so P=(0,4)
(b)
x=[2(2)+3(-3)]/(2+3)=-1
y=[2(6)+3(-4)]/(2+3)=0
so P=(-1,0)
2007-08-16 14:10:20 補充：
thx下層
參考: own
2007-08-16 10:02 pm
By section formula,
a)The x coordinate of P = (1x2 + 2x1)/1 + 2 = 2
The y coordinate of P = (2x2 + 1x8)/1 + 2 = 4
The coordinates of P is ( 2 , 4)
b)The x coordinate of P = [2x2 + 3x(-3)]/2+3 = -1
The y coordinate of P = [2x6 + 3x(-4)]/2+3 = 0
The coordinates of P is ( -1 , 0 )
2007-08-16 14:03:30 補充：
錯左少少野...上層先岩
a)The x coordinate of P = (1x2 + 2x1)/1 + 2 = 2
The y coordinate of P = (2x2 + 1x8)/1 + 2 = 4
The coordinates of P is ( 2 , 4)
b)The x coordinate of P = [2x2 + 3x(-3)]/2+3 = -1
The y coordinate of P = [2x6 + 3x(-4)]/2+3 = 0
The coordinates of P is ( -1 , 0 )
2007-08-16 14:03:30 補充：
錯左少少野...上層先岩
參考: me
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