写一篇30字的数学日记 数学日记30字可以怎么写？
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\u671b\u91c7\u7eb3\uff0cO(\u2229_\u2229)O\u8c22\u8c22\u5566\u3002
我来到了超市,想买一瓶果汁,有两种,一种20元2L,一种10元1.5L
于是,我就买了合算的第一种,后来,妈妈夸我真聪明.
今天我做了很多数学题，其中有应用题，和计算题。应用题最重要的是要把题读懂了，才能做对，而计算题是要仔细算。今天我全做对了，很开心
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