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當然不對啊 兩個數可以是同一個數啊比如5和5
∵一個有理數的絕對值為3, ∴這個有理數是3或-3; ∵另一個有理數的相反數為-4, ∴另一個有理數是4, 則3+4=7或者(-3)+4=1,即這兩個有理數的和為7或1.
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