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∵∠BFC=∠BFE+∠α=90°, ∴∠α=∠BFC-∠BFE, 又 ∵∠FEA=∠B+∠BFE=45°,∠B=30°, ∴∠BFE=45°-30°=15° ∴∠α=∠BFC-∠BFE=90°-15°=75° 答:圖中∠a的度數是75°.
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