2023 袋鼠数学 C-Benjamin 真题 答案 详解

中英双语真题

MATH KANGAROO CHINA Math Kangaroo 2023 (China)-Level C 3 points 1. Holger fills the rest of the table with the numbers up to 40, following the system shown: Holger按照下图所示的规则继续填充表格，一直到数字40。 Which of the pieces shown could he cut from the table? 下面哪个部分可以从这个表格中截取出来？ 2. Matchsticks can be placed to build numbers, as shown. For example, to build the number 15, one needs 7 matchsticks, and one needs the same number of matchsticks to build the number 8. 如图所示，可以用火柴棍拼成数字。例如，要拼成数字15，需要7根火柴棍，拼成数字8需要相同数量的火柴棍。 What is the largest positive number that can be built with seven matchsticks? 七根火柴棍可以拼成的最大正数是多少？ 3. Which of the following shapes cannot be divided into two triangles by a single straight line? 以下哪个图形不能用一条直线分成两个三角形？