人教版四年级数学下册运算定律练习题58Word文档下载推荐.docx
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522-20-80262-11-162
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302
2+3+4+…+19+20+21
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(56+47)+23=56+(____+____)
390+(510+84)=(390+____)+____
____+70=70+27
119-12-88=119〇(12+____)
78×
23=23×
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