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加减乘除运算法则

更新时间: 2021-01-03 08:43:40     

1、乘除法是基本的四则运算,在没有括号的情况下,运算顺序为先乘除,再加减。

加减法。交换律:a+b=b+a,a-b=-b+a。结合律:a+b+c=a+(b+c),a+b-c=a+(b-c)。交换律,ab=ba。结合律,a(bc)=(ab)c。分配律,a(b+c)=ab+ac

2、除法:100(被除数)2(除数)= 50(商)。

关键词: 乘除 运算 法则

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