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a*b=a+b/1-ab -2*5=(-2+5)/1-(-2*5)=3/11
根據你的定義,1×2=1-2分之3,就是1/3,同理1/3×(-3)=1-[1/3×(-3)]分之1/3+(-3),所以答案就是5/8..
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