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整数运算律推小数：简便计算超简单
2026-06-20
网络整理
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Key Point:——不是“把小数当整数算完再点小数点”的粗放迁移，而是以运算律为底层逻辑，用结构一致性打通整数与小数的认知壁垒。真正的小数简便计算，不靠死记技巧，而靠一句口诀：“律不变，位不乱
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