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二年级数学下册五《加与减》小小图书馆精炼北师大版.doc

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13小小图书馆1计算加油站。2竖式计算并验算。 674142=验算：963341=验算： 3下面的计算都存在错误，把正确的竖式写下来。 524109908274把和是 321 的一组叶片圈起来。 25绿色救援队。(连线) 6让利大酬宾。 (1)便宜了多少元? (2)便宜了多少元?3l. 355 152 491 19 2532 622 验算略 3略 4 5略 6(1)387148239(元)(2)698289409(元)

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