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不大於,就是小於等於 把這個數記為a吧,那a應該滿足2<|a|≤6 a是負數,那麼去絕對值:2<-a≤6=>-6≤a<-2 很明顯,a可以取-6、-5、-4、-3 ∴所有可取的負整數值和為(-6)+(-5)+(-4)+(-3)=-18
|x|
-3,-2,-1,0,1,2,3 和為0
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