作业帮39*148/149+148*86/149+48*74/149= 要简便
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39*148/149+148*86/149+48*74/149= 要简便
39*148/149+148*86/149+48*74/149= 要简便
39*148/149+148*86/149+48*74/149= 要简便
39*148/149+148*86/149+48*74/149
＝39×148/149＋86×148/149＋24×148/149
＝（39＋86＋24）×148/149
＝149×148/149
＝148