(80＋1/78）×79
=80X79+1/78x79
=80X(80-1)+1/78X(78+1)
=80X80-80X1+1/78X78+1/78X1
=640-80+1+1/78
=561+1/78
=561又1/78
（224＋1/222）×1/223
=（223+1+/222）X1/223
=【223+（1+1/222）】X1/223
=（223+223/222）X1/223
=223X1/223+223/222X1/223
=1+1/222
=1又1/222
简便计算几道.（80＋1/78）×79（224＋1/222）×1/2231/2＋1/6＋1/12＋……1/90
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