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锟斤拷锟斤拷|a|锟斤拷示锟斤拷(sh锟斤拷)锟絊锟较碉拷锟絚a锟絚原锟絚锟侥撅拷锟絰锟斤拷锟斤拷锟斤拷(sh锟斤拷)a锟侥絕锟斤拷值锟斤拷

锟斤拷锟斤拷锟缴傦拷锟斤拷要锟斤拷锟絴锟斤拷1.|ab|=|a||b|;|a/b|=|a|/|b|

锟斤拷锟斤拷2.|a|<|b|锟斤拷锟斤拷a2

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锟斤拷锟斤拷|a|-|b|≤|a+b|≤|a|+|b|锟斤拷锟斤拷锟揭僅锟斤拷ab≤0锟絩锟斤拷邊锟斤拷號锟斤拷锟斤拷锟斤拷ab≥0锟絩锟斤拷邊锟斤拷號锟斤拷锟斤拷锟斤拷

锟斤拷锟斤拷|a|-|b|≤|a-b|≤|a|+|b|锟斤拷锟斤拷锟揭僅锟斤拷ab≥0锟絩锟斤拷邊锟斤拷號锟斤拷锟斤拷锟斤拷ab≤0锟絩锟斤拷邊锟斤拷號锟斤拷锟斤拷锟斤拷

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锟斤拷锟斤拷(|a+b|锟斤拷示a-b锟絚原锟絚锟侥撅拷锟絰锟斤拷也锟斤拷示a锟絚b之锟絞锟侥撅拷锟絰)

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锟斤拷锟斤拷|a|={a锟斤拷(a>0)锟斤拷a锟斤拷(a=0)锟斤拷锟斤拷a锟斤拷(a<0)锟斤拷}

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锟斤拷锟斤拷锟紷锟斤拷锟斤拷見锟斤拷a锟斤拷b同號锟斤拷锟斤拷一锟斤拷锟斤拷0锟絩锟斤拷锟斤拷式锟斤拷號锟斤拷锟斤拷锟斤拷

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锟斤拷锟斤拷锟斤拷|a|-|b|≤|a+b|

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