help
问题描述:
help
在正方形ABCD中,M是边BC的中点,E是边AB上的一个动点,MF垂直于ME,交射线CD于点F,AB=4,BE=X,DF=Y
问(1)求Y关于X的函数解析式,并写出定义域
(2)当点F在边CD上时,四边形AEFD的周长是否随点E的运动而发生改变?请说明
(3)当DF=1求点A到直线BF的距离
sorry,是当DF=1求点A到直线EF的距离
答
(1)求Y关于X的函数解析式,并写出定义域
根据△EBM∽△MCF得
x/2=2/4-y
化简得
y=4-4/x(0
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