第四章  四則運算規律
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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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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



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