如图,ABCD和ABEF都是边长为1的正方形,AM=FN,现将两个正方形沿AB折成一个直二面角,O∈AB,平面MON∥平面CBE.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224318610818414/SYS201311012243186108184019_ST/images0.png)
(1)求角MON大小;
(2)设AO=x,当x为何值时,三棱锥A-MON的体积V最大?并求出最大值.
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