P(cosa , sina)
Q(3,0)
M(x,y)
x=(3+cosa)/2
y=(sina+0)/2
2x-3=cosa
2y=sina
平方后相加:
(2x-3)^2+(2y)^2=1
(x-3/2)^2+y^2=1/4cosa和sina的平方后咋变成1和1/4了(2x-3)^2=cos^2a.............1(2y)^2=sin^2a...............21式+2式: (2x-3)^2+(2y)^2=cos^2a+sin^2a=1两边同除以4(x-3/2)^2+y^2=1/4cos^2a+sin^2a应该是cosa^2+sina^2吧?没人了?(cosa)^2+(sina)^2=1GOOD
当点P在圆x²+ y²=1上运动时,P与定点Q(3,0)的连线的中点M的轨迹方程是?
当点P在圆x²+ y²=1上运动时,P与定点Q(3,0)的连线的中点M的轨迹方程是?
数学人气:272 ℃时间:2019-12-16 19:53:02
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