39*148/149+148*86/149+48*74/149jianbian jianbian
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![39*148/149+148*86/149+48*74/149jianbian jianbian](/uploads/image/z/195133-13-3.jpg?t=39%2A148%2F149%2B148%2A86%2F149%2B48%2A74%2F149jianbian+jianbian)
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39*148/149+148*86/149+48*74/149jianbian jianbian
39*148/149+148*86/149+48*74/149
jianbian jianbian
39*148/149+148*86/149+48*74/149jianbian jianbian
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
答案应该为(39*148+148*86+48*74)/149=148
39*148/149+148*86/149+48*74/149
=39*148/149+148*86/149+24*148/149
=148/149*(39+86+24)
=148/149*149
=148