# vocabulary for chapter 1

1. rational numbers 有理数 2. integer 整数 3. fraction 分数 4. decimal 小数 5. number line（axis）数轴 （ ） 6. origin 原点 7. unit length 单位长度 8. opposite numbers 相反数 9. absolute value 绝对值 10. simplify 化简 11. is greater than > 12. is less than < 13. Is greater than or equal to 大于 等于 14. addition 加法

15. subtraction 减法 16. multiplication 乘法 17. division 除法 18. commutative law 交换律 19. associative law 结合律 20. Mixed operation 混合运算 21. reciprocal 倒数 22. distributive law 分配率 23. parenthesis 括号 24. Involution =乘方

25. Exponent 指数 26. base number 底数 27. scientific notation 科学计数法 28. approximate number 近似数

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