1.一个东西 means one of items probably there is only one type of such items.
e.g: 从那袋橘子中挑出一个来
2.一样东西 means one type of items however, there are all kinds of items there.
e.g.:assume there are a wide variety of mooncakes, and you say:每一样月饼都买一个。
١٢ سبتمبر ٢٠١٣
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一个东西和一样东西is the same meaning. But 一样的东西means the same thing.