学而思期末串讲讲义教师版好题+答案.pdf

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DN? DN=BN?MDN=90 ? ? CEF ? C ? 2 ? MN2=AM2+BN2? ? 16 ? 15 ?-?-? ? ? ?ACM ? CE ?DCM? DN? ?DCMACM?1 ? ?CD=CA?DM=AM?DCM=ACM?CDM=A ?CA=CB? ?CD=CB?2 ? ? ?DCN=ECF-?DCM=45-?DCM ?BCN=ACB-?ECF-?ACM =90-45-?ACM=45-?ACM ?DCN=BCN ?3 ? ?CN=CN? ?CDNCBN? ?4 ? ?DN=BN?CDN=B? ?MDN=CDM+CDN=A+B=90? ?5 ? ?Rt