一次函数与反比例函数已知直线AB与x轴交于点C,与双曲线y=k/x交于A(3,20/3)、B(-5,a)两点.AD⊥x轴于点D,BE//x轴且与y轴交于点E1)求点B的坐标及直线AB的解析式；2）判断

问题描述：

一次函数与反比例函数
已知直线AB与x轴交于点C,与双曲线y=k/x交于A(3,20/3)、B(-5,a)两点.AD⊥x轴于点D,BE//x轴且与y轴交于点E
1)求点B的坐标及直线AB的解析式；
2）判断四边形CBED的形状,并说明理由.
（只求第二问）

最佳答案：

B(-5,-4) E(0,-4) D(3,0) C(-2,0)
CD=5=BE
BC=5=DE
四边形CBED是菱形,四边相等的平行四边形

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