人教版四年级数学下册第一单元四则混合运算专项练习题189Word格式文档下载.docx
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5(79+9)×
6
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(21÷
7)5120÷
64+28+30574÷
(87-73)-15
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6450+510÷
170+177721-561÷
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468+244=148+377=606-57=877-245=
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