一道急需解决的SAT2 Math问题The set of odd intergers is closed under?正答：multiplication

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一道急需解决的SAT2Math问题Thesetofoddintergersisclosedunder?正答：multiplication一道急需解决的SAT2Math问题Thesetofoddinte

一道急需解决的SAT2 Math问题The set of odd intergers is closed under?正答：multiplication
一道急需解决的SAT2 Math问题
The set of odd intergers is closed under?
正答：multiplication

一道急需解决的SAT2 Math问题The set of odd intergers is closed under?正答：multiplication
又是你啊
题目的意思是 一个整数为奇数的集合接近于下面哪个集合.?
set集合
odd 奇数
integers 整数
multiplication 在此翻译为”它们相乘的集合“,乘法有下面这种性质：
even × even = even;
even × odd = even;
odd × odd = odd.
even 为偶数
所以意思是,接近于一个与它们相乘后的集合
odd set: {1, 3, 5, 7, 9, ...}
multiply each term: { 1x3, 1x5, 1x7 ... 3x5, 3x7, 5x7, 5x9 ...} 这些同样也都是奇数
而加减法 1+3=4为偶数,就不属于奇数的集合了

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