∵∠BAC=∠EAF=α,
∴∠FAC=∠EAB,
又∵AB=AC,AF=AE,
∴△AFC≌△AEB,
∴∠ACF=∠ABE,
∴点A、B、C、M共圆,
∴∠AMB=∠ACB,
∵AB=AC,∠BAC=α,
∴∠ACB=1 /2 (180°-α)=90°-1 /2α,
∴∠AMB=90°-1/2α,
∴∠AME=180°-(90°-1/2α)=90°+1/2 α.
∵∠BAC=∠EAF=α,
∴∠FAC=∠EAB,
又∵AB=AC,AF=AE,
∴△AFC≌△AEB,
∴∠ACF=∠ABE,
∴点A、B、C、M共圆,
∴∠AMB=∠ACB,
∵AB=AC,∠BAC=α,
∴∠ACB=1 /2 (180°-α)=90°-1 /2α,
∴∠AMB=90°-1/2α,
∴∠AME=180°-(90°-1/2α)=90°+1/2 α.