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第四章 四則運算規律

第四章 四則運算規律. 四則運算規律. 只有加減或乘除時，算式由左到右。. 交叉混合時，先乘除後加減。. 有括號時，括弧內的算式要先算。. = ＋ = + =. = - = 0. = 0.25 ＋ 0.3 = 0.55. = 0.28 - 0.2 = 0.08. 有括號時，括弧內的算式要先算。.

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第四章 四則運算規律

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  1. 第四章 四則運算規律

  2. 四則運算規律 • 只有加減或乘除時，算式由左到右。 • 交叉混合時，先乘除後加減。 • 有括號時，括弧內的算式要先算。

  3. = ＋ =+= =- = 0 =0.25 ＋ 0.3 =0.55 =0.28-0.2 =0.08

  4. 有括號時，括弧內的算式要先算。

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