lim [x→+∞] (1^x+2^x+3^x)^(1/3)
=lim [x→+∞] (1+2^x+3^x)^(1/3)
底数显然是正无穷大,无穷大开三次方还是正无穷大.
希望可以帮到你,如果解决了问题,请点下面的"选为满意回答"按钮,