【原】Bilingual Mathematics Teaching（5）Rational Numbers

Words and Expressions

67	有理数	rational number
68	正数	positive number
69	负数	negative number
70	符号	sign
71	非负数	non-negative
72	数轴	number axis
73	原点	origin
74	正方向	positive direction
75	单位长度	unit length
76	相反数	opposite number
77	绝对值	absolute number
78	倒数	reciprocal
79	乘方	power
80	幂	power
81	底数	base number
82	指数	exponent
83	科学记数法	scientific notation

Examples

1、1 and -1 are opposite numbers.

1和-1互为相反数。

2、(1)2 to the power of 3

     (2)2 to the third power

     (3)the third power of 2

2的3次方。

3、Integers and fractions are called by an umbrella term rational number.

整数和分数统称为有理数。

4、If earning fifty yuan is written as +50, paying fifty yuan should be written as -50.

如果收入50元记作+50，那么支出50元应记作-50.

5、All the rational numbers can be marked on a number axis.

所有的有理数都可以在数轴上表示。

6、Among two negative numbers, the one with greater absolute value is less than the other.

两个负数比较大小，绝对值大的反而小。

7、In scientific notation， all numbers are written in the form a×10^n， where 1≤|a|<10 and n is a positive integer.

科学记数法中，所有的数都被写成a×10^n的形式，其中1≤|a|<10，n是正整数。