A:2a2+3a2=5a2
B:(a﹣b)2=a2﹣b2
C:a3•a2=a6
D:(﹣2a3)2=8a6
Jim records his physical training every time so that he can________it and think about how he should improve it the next day.
Mike wants some ________ to eat.
如图,在△ABC中,AB=AC,∠A=30°,E为BC延长线上一点,∠ABC与∠ACE的平分线相交于点D,则∠D的度数为( )