试题 试卷
题型:脱式计算 题类: 难易度:困难
2022.10.29数据谷八中数学新思学第14套
3.75×2.1+7.9×3.75
=3.75×(2.1+7.9)
=3.75×10
=37.5
21×98
=21×(100-2)
=21×100+21×2
=2100+42
=2142
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