有6轮卡车和4轮轿车共25辆,一共116个轮子,问有8辆卡车和17辆轿车。
(25*6-116)/(6-4)
=17
卡车=25-17=8辆。
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/9f2f070828381f3035f288eea7014c086f06f08a?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
减法属性:
1、反交换率
减法是反交换的。如果a和b是任意两个数字,那么
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/37d12f2eb9389b500acae4158b35e5dde7116ebb?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
2、反结合律:
减法是反结合的,当试图重新定义减法时,它就会出现。应该表达
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/f7246b600c338744e70b2a3b5f0fd9f9d62aa0ae?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
定义意味着a-b-c或a−(b−c)?这两种可能性给出了不同的答案。要解决这个问题,必须建立一个操作顺序,不同的命令给出不同的结果。
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/37d3d539b6003af3576d34fd272ac65c1138b65c?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_450%2Ch_600%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
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