七年级上册数学书答案 第26页13题答案
人气:168 ℃ 时间:2019-10-10 01:14:33
解答
第一天0.3-(-0.2)=0.5元 第2天 0.2-(-0.1)=0.3元 第3天 0-(-0.13)=0.13元
平均值 (0.5+0.3+0.13)/3=0.31元
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