Cae真题1音响

解:(1) ∵ ∠ bad = 60,∠ EAD = 15,∴ ∠ BAE = ∠ bad-∠ EAD = 45,∵AE平分。(2)∫(1)∠EAD = 15,∠ ACB-∠ B = 60-30 = 30,发现∠ ACB-∠ B = 2 ∠。(3)在图2的△ABC中,∠ACB > 90°,那么(2)中的结论仍然成立。原因如下:∵ In △ABC,AD⊥BC,AE份额∠BAC,∴∠ADC =∞。