新定义一种运算a△b=(a+b)/(1-ab),求(-2)△(-1/3)的值

问题描述:

新定义一种运算a△b=(a+b)/(1-ab),求(-2)△(-1/3)的值

(-2)△(-1/3)
= [-2 + (-1/3)]/[1-(-2)(-1/3)]
= (-7/3)/(1-2/3)
= (-7/3)/(1/3)
= -7