AMC 8 2000 Problem 22
AMC8 2000 年第 22 题
立体几何★★★☆☆
A cube has edge length $2$. Suppose that we glue a cube of edge length 1 on top of the big cube so that one of its faces rests entirely on the top face of the larger cube. The percent increase in the surface area (sides, top, and bottom) from the original cube to the new solid formed is closest to
一个正方体边长为 2。假设我们把一个边长为 1 的正方体粘贴到这个大的正方体的顶面，使得小正方体的一个面整个的放在大正方体的顶面上。则和原来大正方体的表面积（侧面，顶面， 底面）相比较，所形成的新的立体图形的表面积增加的百分数最接近于百分之多少？ Problem 23 There is a list of seven numbers. The average of the first four numbers is 5, and the average of the last four numbers is 8. If the average of all seven numbers is sets of four numbers is, then the number common to both 有一组 7 个数。前面 4 个数的平均值是 5，最后 4 个数的平均值是 8。若所有这 7 个数的平均值是 ，那么前面 4 个数和最后 4 个数共同拥有的那个数是
- A.10
- B.15
- C.17
- D.21
- E.25
正确答案 · Correct Answer
C
解析 · Solution
解析整理中
继续练习