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已知抛物线G的顶点在原点，焦点在y轴正半轴上，点P(m，4)到其准线的距离等于5， (Ⅰ)求抛物线G的方程； ( Ⅱ)如图，过抛物线G的焦点的直线依次与抛物线G及圆x 2 +(y-1) 2 =1交于A，C，D，B四点，试证明|AC|· |BD|为； (Ⅲ)过A，B分别作抛物线G的切线l 1 ，l 2 ，且l 1 ，l 2 交于点M，试求△ACM与△BDM面积之和的最小值．
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