39乘以148/149+148乘以86/149+48乘以74/149
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39乘以148/149+148乘以86/149+48乘以74/149
![39乘以148/149+148乘以86/149+48乘以74/149](/uploads/image/z/10009758-30-8.jpg?t=39%E4%B9%98%E4%BB%A5148%2F149%2B148%E4%B9%98%E4%BB%A586%2F149%2B48%E4%B9%98%E4%BB%A574%2F149)
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
=39*148/149+86*148/149+24*148/149
=148/149*(39+86+24)
=148/149*149
=148
39乘以148/149+148乘以86/149+48乘以74/149
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