把图画出来 作MD垂直于AB
所以 MD=MC OM=m A（-6 0） C（0 2）
所以 CM=根号下m的平方+4=MD
用三角函数 OB比AB=1/根号5
所以 MD比AM=1/根号5
所以 MA=根号下5乘m的平方+4
且 AM还=6-|m|
所以列等式 正数解|m|=1 所以m=-1
再用三点坐标 B（0 3）求解析式
例如1、Tom is_____English.He is _____English boy.
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