设科技书x本
5/4x=45
x=36
图书角有文艺书45本,比科技书多4分之1,科技书有多少本?
图书角有文艺书45本,比科技书多4分之1,科技书有多少本?
数学人气:163 ℃时间:2020-01-26 04:18:52
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