时间:2020-03-23 05:03:44
按1千克废纸可生产0.75千克再生纸,生产1敦志要砍掉16棵大树计算。
1.五年级3个班去年一共收集废纸160千克,可生产再生纸多少千克?合多少吨?
2.五年级3个班去年收集的废纸量相当于保护了多少棵大树?
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