来自伦卿卿的问题
初一数学上册有理数的所有公式?
初一数学上册有理数的所有公式?
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2019-06-14 01:57
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田景成
①加法的交换律a+b=b+a；②加法的结合律a+(b+c)=(a+b)+c；③存在数0,使0+a=a+0=a；④对任意有理数a,存在一个加法逆元,记作-a,使a+(-a)=(-a)+a=0；⑤乘法的交换律ab=ba；⑥乘法的结合律a(bc)=(ab)c；⑦分配律a(...
2019-06-14 02:00:32
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