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∠1= ∠5(同位角相等)则AE// BF
∠6 =∠ ABC(同位角相等)则AE// BF
∠5+∠4+∠ABC=180(同旁内角互补 )则AE// BF
∠1+∠ 4+∠6= 180不可以
∠COE=36°
∠AOD=∠COB=126°