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幻灯片 1

AE=AB,∠EAB=90°, 又在正方形ACFG中, AG=AC,∠GAC=90°, ∴∠EAB=∠GAC=90°. ∴∠EAC=∠GAB, ∴ EAC≌ GAB, ∴EC=GB. ∵∠EAC=∠EAB+ ...

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幻灯片 1