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ijͬѧѧϰ˱̺дһʵij򣬵һֵĻĽܱȸƽ1ͬѧ˳󣬰ĻĽٴ룬ĻĽΪ   
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רȨ⡰ijͬѧѧϰ˱̺дһʵij򣬵һ..Ҫ  ʵ  ȿ⡣Щġ£

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  • ʵ㣺
    ʵ޲ѭСͰͷѧϣʵֱ۵ضΪϵĵһһӦʵԭʵǡʵڵ
    ʵʵֵĻмӡˡ˷ȣԷǸ0Խп㡣ʵӡˡΪ㣩ƽʵκʵԿηʵֻзǸʵܿżηʵ

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    ʵRԼӡˡΪ㣩зԣʵĺ͡̣Ϊ㣩Ȼʵ

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    1ͬӣȡͬķţǵľֵӣ
    2ӣȡֵļķţýϴľֵȥСľֵ
    ʹ
    ټӷɣӣλãͲ䣻a+b=b+a
    ڼӷɣӣȰǰӣȰѺӣͲ䣻a+b+c=a+b+c

    2򣺼ȥһڼ෴a-b=a+-b


    1ˣͬȡȡѾֵˡ
    2nʵˣһΪ0Ϊ0n0ʵˣķɸĸżʱΪΪʱΪ
    3˷ʹ
    ٳ˷ɣˣλã䣬ab=ba
    ڳ˷ɣˣȰǰˣȰѺˣ䣬abc=abc
    ۷ɣһͬĺˣڰֱͬˣٰѻ,ab+c=ab+ac

    4
    1ͬŵŵøѾֵ
    2һڳĵ
    30κ00

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