48克氧化铁跟多少克四氧化三铁的含铁量相等
48克氧化铁跟多少克四氧化三铁的含铁量相等
数学人气:805 ℃时间:2019-10-23 11:14:34
优质解答
48*112/160=x*168/232 x=46.4
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