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數軸上到表示-2的點的距離為3的點,表示的意思是在數軸上距離-2這個點的長度為3個組織的點有哪些?從數軸上可以直觀的看出有1和-5兩個點. 用數學的解方程也可以解釋為: 設這個數為X那麼由絕對值的意義知道 Ix-(-2)I=3,那麼x-(-2)=3時,解得X1=1,x-(-2)=-3時,解得X2=-5所以這個數是1或-5
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