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ʵѭСͰͷѧϣʵֱ۵ضΪϵĵһһӦʵԭʵǡʵڵ
ʵʵֵĻмӡˡ˷ȣԷǸ0Խп㡣ʵӡˡΪ㣩ƽʵκʵԿηʵֻзǸʵܿżηʵԣ
ʵRԼӡˡΪ㣩зԣʵḷ́͡Ϊ㣩Ȼʵ- ʵ㷨
1ӷ
1ͬӣȡͬķţǵľֵӣ
2ӣȡֵļķţýϴľֵȥСľֵ
ʹ
ټӷɣӣλãͲ䣻a+b=b+a
ڼӷɣӣȰǰӣȰѺӣͲ䣻a+b+c=a+b+c
2ȥһڼ෴a-b=a+-b
3˷
1ˣͬȡȡѾֵˡ
2nʵˣһΪ0Ϊ0n0ʵˣķɸĸżʱΪΪʱΪ
3˷ʹ
ٳ˷ɣˣλã䣬ab=ba
ڳ˷ɣˣȰǰˣȰѺˣ䣬abc=abc
۷ɣһͬĺˣڰֱͬˣٰѻ,ab+c=ab+ac
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30κ00
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