正无穷大加正无穷大等于多少? 负无穷大加正无穷大等于多少？ 负无穷大加负无穷大等于多少？如果是乘呢？

Question

如题所述

Answer 1

+∞ + +∞ = +∞
-∞ + +∞ =不确定
-∞ + -∞ = -∞

+∞ × +∞ = +∞
-∞ × +∞ =-∞
-∞ × -∞ = +∞本回答被提问者采纳