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你的“a*b=a(a
你定義的新運算是a*b = a*b/(a+b)的意思嗎?如果是,計算如下: 2*10= 2*10/(2+10)= 20/12=5/3 5/3 * 10 = 5/3 * 10 /(5/3 + 10)= 5*10*3/(5+10*3)= 150/35 = 30/7
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