102.31×59 简便计算 急
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102.31×59简便计算急102.31×59简便计算急102.31×59简便计算急102.31×59=102.31×60-102.31=6138.6-102.31=6036.29102.31×(60
102.31×59 简便计算 急
102.31×59 简便计算 急
102.31×59 简便计算 急
102.31×59
=102.31×60-102.31
=6138.6-102.31
=6036.29
102.31×(60-1)=102.31×60-102.31=6036.29
102.31X(60－1）＝102.31X60－102.31
102.31×60-102.31
(100+2.31)（60-1）=6000-100+（2+0.31）60-2.31
=5900+120+18.6-2.31
=6020+16.29
=6036.29