3.有一张厚度是0.1mm的纸,将它对折1次后,厚度为2×0.1mm

(1)对折2次后,厚度为多少毫米?
(2)假设对折20次,厚度为多少毫米?
(3)每层楼平均高度为3m,这张纸对折20次后有多少层楼高?
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(1)对折2次后,厚度为多少毫米?
(2)假设对折20次,厚度为多少毫米?
(3)每层楼平均高度为3m,这张纸对折20次后有多少层楼高?