如图,在△ABC中,AB=AC,点O在△ABC内,且∠OBC=∠OCA,∠BOC=110°,求∠A的度数=____
socks shoes those this look at certainly are
已知A=1x+1,B=x-1x2+2x-1,求A与B的差;当x≠﹣1时,比较A与B的大小.