39乘以149分之148乘以149分之86加48乘以149分之74等于? 俺要简便方法,就在今天

问题描述:

39乘以149分之148乘以149分之86加48乘以149分之74等于? 俺要简便方法,就在今天

39*148/149+148*86/149+48*74/149
=39*148/149+86*148/149+24*148/149
=148/149*(39+86+24)
=148/149*149
=148