(2))∠EAF=∠BAC-∠BAE-∠CAFAB垂直平分线交BC于点E,垂足为点M,∴BE=AE∴∠B=∠BAE,∠C=∠CAF,∴∠EAF=∠BAC-∠B-∠C=∠BAC-(∠B+∠C)=∠BAC-(180°-BAC)=2∠BAC-180°由已知∠BAC+∠EAF=150°∴∠EAF=∠150°-BAC,∴∠150°-BAC=2∠BAC-180°∴∠BAC=110°。请采纳 谢谢!