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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?
人气:232 ℃ 时间:2020-05-22 06:57:22
解答
+∞ + +∞ = +∞
-∞ + +∞ =不确定
-∞ + -∞ = -∞
+∞ × +∞ = +∞
-∞ × +∞ =-∞
-∞ × -∞ = +∞
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