已知?jiǎng)狱c(diǎn)P在曲線2x2-y=0上移動(dòng),則點(diǎn)A(0,-1)與點(diǎn)P連線中點(diǎn)的軌跡方程是 .
【答案】分析:設(shè)出點(diǎn)A(0,-1)與點(diǎn)P連線中點(diǎn)的坐標(biāo),利用中點(diǎn)坐標(biāo)公式可得P(2x,2y+1),根據(jù)動(dòng)點(diǎn)P在曲線2x2-y=0上移動(dòng),代入方程即可求得點(diǎn)A(0,-1)與點(diǎn)P連線中點(diǎn)的軌跡方程
解答:解:設(shè)點(diǎn)A(0,-1)與點(diǎn)P連線中點(diǎn)坐標(biāo)為(x,y),則由中點(diǎn)坐標(biāo)公式可得P(2x,2y+1),
∵動(dòng)點(diǎn)P在曲線2x2-y=0上移動(dòng),
∴2(2x)2-(2y+1)=0
即8x2-2y-1=0
故答案為:8x2-2y-1=0.
點(diǎn)評(píng):本題考查軌跡方程的求法,考查中點(diǎn)坐標(biāo)公式,考查代入法的運(yùn)用,解題的關(guān)鍵是確定動(dòng)點(diǎn)坐標(biāo)之間的關(guān)系.