Что это за свойства: 1.a+(b+c)=(a+b)+c=a+b+c. 2.a+b=b+a. 3.a-(b+c)=a-b-c. 4.(a+b)-c=(a-c)+b. 5.a+0=0+a. 6.a-0=a. 7.a-a=0
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