- RegionalEnergyIntensityChangeDecompositionsBasedonGFITechnique;Therefore,inGFI,theorganizingprincipleisquitedifferenttotraditionallanguageteaching.GFISoftwareofCary,NorthCarolina,hasannouncedthatitsGFIMailEssentialsanti-spamandanti-phishingproductisn...
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- 问题详情:如图,正方形ABDE、CDFI、EFGH的面积分别为25、9、16,△AEH、△BDC、△GFI的面积分别为S1、S2、S3,则S1+S2+S3= .【回答】18.【解答】解:∵DF=DC,DE=DB,且∠EDF+∠BDC=180°,过点A作AI⊥EH,交HE的延长线于点I,∴∠I=∠DFE=90°,∵∠AEI+∠DEI=∠DEI+∠DEF=90°,∴∠AEI=∠DE...
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