规律 (uw)}'='v+w' (w)"=(u'v+w')'=u"v+2uy'+uw" (w)"=u"y+3uv'+3u'v"+uw" 用数学到归纳法可证 (m)o=∑C-w k=0 规律 + 3u  v  (uv) = u  v + uv  (uv) = (u  v + uv ) = u  v + 2 u  v  + uv  (uv) = u  v + 3u  v  + uv  用数学归纳法可证 ( ) ( ) ( ) 0 ( ) n n k n k k n k uv u v − = = C