抛硬币5次,记其中正面向上的次数为X,则P{X≤4}=____.
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如图所示组合梁由AC和CD在C处铰接而成,梁的A端插入墙内,B处铰接一根二力杆OB,已知:F=20kN, q=10kN/M,M=20 kN•m,不计自重和摩擦,试求插入端A及铰链B对杆CD的约