判断对错,说出理由.1800/25+2200/75 - 知识问答

判断对错,说出理由.1800/25+2200/75=(1800+2200)/(25+75)=.(省略)谢

1个回答

错了
分数相加首先要使分母相等
即先通分
所以1800/25+2200/75
=(1800*3)/(25*3)+2200/75
=5400/75+2200/75
=(5400+2200)/75
=7600/75
=(304*25)/(3*25)
=304/3

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