问题
解答题
12anb2[bn-1-2abn+1+（-1）-1bn-1]+24an+1bn+3．
答案
原式=12anb2（bn-1-2abn+1-bn-1）+24an+1 b n+3
=12anbn+1-24an+1b n+3-12anbn+1+24an+1 b n+3
=12anbn+1-12anbn+1
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12anb2[bn-1-2abn+1+（-1）-1bn-1]+24an+1bn+3．
原式=12anb2（bn-1-2abn+1-bn-1）+24an+1 b n+3
=12anbn+1-24an+1b n+3-12anbn+1+24an+1 b n+3
=12anbn+1-12anbn+1