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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简便计算几道.(80+1/78)×79(224+1/222)×1/2231/2+1/6+1/12+……1/90
简便计算几道.
(80+1/78)×79
(224+1/222)×1/223
1/2+1/6+1/12+……1/90

简便计算几道.(80+1/78)×79(224+1/222)×1/2231/2+1/6+1/12+……1/90
(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

1、80×79+1/78×(79+1)