........................9分\rLOCD=LADC=LCFE=90°,\r四边形CDEF为矩形.DE=CF=5.\rAAD=AE+ED-50cm......................................................................................10分\r23.(1)448尸或乙尸或4M8C或Z.8ME.(注:任意写出一个即可).......2分\r(2)①15,15....................................................................................................................4分\r②LMBQ=Z.CBQ...................................................................................................5分\r(注:若没有写出判断结果,但后续证明正确,不扣分)\r理由如下:\r•••四边形46C。是正方形,.•"BuSC,乙4=ZC=90°.\r由轴对称性质,得RM=AB/BMP=4/1=90°.\rLBMQ=Z.C=90°,BM=BC.\r:BQ是公共边,\rRSMBQgRt^CBQ.\r乙MBQ=LCBQ.................................................................................................8分\r(3):;由或胃皿...................................................10分\r数学试题参考答案第4页(共4页)
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