2022 袋鼠数学 E-Junior 真题 答案 详解

中英双语真题

MATH KANGAROO CHINA Math Kangaroo 2022 (China) - Level 5 3 points 1. Carola is forming the four-digit number 2022 using some matches from a box. The box originally contained 30 matches. She has already started and formed the first two digits, as shown in the diagram. How many matches will remain in the box when she has finished forming 2022? Carola 用火柴盒里的火柴来摆成四位数字 2022。火柴盒原先有 30 根火柴，她已经摆好了前两位数字，如图所示。请问当她摆好 2022 后，火柴盒里还剩多少根火柴？ (A) 20 (B) 19 (C) 10 (D) 9 (E) 5 2. An equilateral triangle of side 12 has the same perimeter as a square of side x. What is the value of x? 一个边长为 12 的等边三角形与一个边长为 x 的正方形的周长相同，请问 x 的值是多少？ (A) 9 (B) 12 (C) 16 (D) 24 (E) 36 3. Some shapes are drawn on a piece of paper. The teacher folded the left-hand side of the paper over the thick line. How many of the shapes on the left-hand side will fit exactly on top of a shape on the right-hand side? 如图所示，一张纸上画有一些图形。老师将纸的左边沿着粗线对折。请问纸张左边有多少个图形恰好和右边的图形重合？ (A) 1 (B) 2 (C) 3 (D) 4 (E) 5 4. Katrin arranges tables of size 2 × 1 according- ing to the number of participants in a meeting. The diagrams show a top view of the tables for a small, a medium and a large meeting. How many tables are used for the large meeting? Katrin 根据参会者数量准备了一些大小为 2 × 1 的小桌子，右图分别表示小型、中型和大型会议 桌子摆放的俯视图。请问大型会议一共需要用到多少张小桌子？ (A) 10 (B) 11 (C) 12 (D) 14 (E) 16