新定义一种运算a△b=(a+b)/(1-ab),求(-2)△(-1/3)的值
人气：193 ℃ 时间：2020-06-11 04:46:08
解答
(-2)△(-1/3)
= [-2 + (-1/3)]/[1-(-2)(-1/3)]
= (-7/3)/(1-2/3)
= (-7/3)/(1/3)
= -7
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