6.如图在底面为直角梯形的四棱锥 abcdbc=6 Ⅰ求证 Ⅱ求二面角的平面角的余弦值 解Ⅰ如图建立坐标系则 Template




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tomski6.如图在底面为直角梯形的四棱锥 abcdbc=6 Ⅰ求证 coloring