1、一些易混淆的术语:和sum 差difference 积product 商quotient
2、如果在题目中见到一些怪异的符号如@,不必理它,那只是ETS的障眼法,不影响解题。
3、质数及合数 :除2外所有的质数都是奇数,1不是质数。质数都是正数。
4、等差数列,等比数列等差数列和=n/2
5、值域=最大值-最小值:重数:集合中出现次数最多的数;标准方差特性:一组数中所有数都同加或同减一个数,其标准方差不变。
6、线速度V,角速度A :A=V360/
7、摄氏,华氏 :c=5/9 ,0C=32F,100C=212F,37C=98.7F
11.排列组合:P=n!/! P=n!
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