求圓(x-1/2)^2+(y+1)^2=5/4關(guān)于直線x-y+1=o,對稱的圓的方程
求圓(x-1/2)^2+(y+1)^2=5/4關(guān)于直線x-y+1=o,對稱的圓的方程
數(shù)學(xué)人氣:855 ℃時間:2020-01-28 18:06:28
優(yōu)質(zhì)解答
x-1/2)^2+(y+1)^2=5/4 圓心A(1/2,-1),過A作直線m⊥L:x-y+1=0.(1) m斜率-1,方程y+1=-1(x-1/2),x+y+1/2=0.(2) 由(1),(2)得m,l交點O(-3/4,1/4)為AA’中點 對稱的圓心A’(x1,y1):(1/2+x1)/2=-3/4,x1=-2 (-1+y1)/2=1/4...
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