④⑦ ⑤②
第一：已知点C为线段AB上一点,并且AC=12分之5 AB,点D为线段AB上另一点,D分线段AB所得两条线段的长为5：11,若CD=20cm,求AB的长.
第二：将一张长方形的纸对折,得到一条折痕,继续对折,对折时每次折痕与上次折痕保持平行,连续对折6次,可以得到几条折痕?如果对折10次呢?对折n次呢?
人气：165 ℃ 时间：2019-12-01 13:47:03
解答
回答：(1)5/12-5/16=5/48；20cm/（5/48）=192cm
(2)对折六次：10条
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