三升四年级数学暑假必做《简便计算》
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简介
26×103 =26×(100+3) =26×100+26×3 =2600+78 =2678 202×13 =(200+2)×13 =200×13+2×13 =2600+26 =2626 98+303 =98+3+300 =101+300 =401
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