﻿ ﻿﻿﻿ 以 d 开头的数学词汇 | 玄数
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## 以 d 开头的数学词汇

2012-10-07
data   数据

• The observations gathered from an experiment, survey or observational study. Often the data are a randomly selected sample from an underlying population. • Statistics or other information represented in a form suitable for processing by computer.

date   日期
A particular month, day, and year at which some event happened or will happen.

decade   十年
A period of ten years, especially a continuous period, such as 1910~1919 or 2009~2018.

decagon   十边形
A polygon with ten sides and ten angles. decahedron   十面体
A solid figure having ten plane faces.

decimal   十进制
A number written using the base 10.

12345 = 1×105 + 2×104 + 3×103 + 4×102 + 5×100

decimal fraction   十进制分数，小数
A fraction whose denominator is some power of 10, usually indicated by a dot (decimal point or point) written before the numerator: as 0.4 = 4/10; 0.126 = 126/1000.

decimal number system   十进制数字系统
A positional system of numeration that uses decimal digits and a base of ten. decimal point   小数点
A dot written in a decimal number, as in 8.6, to indicate the place where values change from positive to negative powers of 10.

decrease   减少
To become or cause to become less or smaller, as in number, amount, or intensity.

deduct   扣除
To take away (a quantity) from another; subtract.

degree   度

• A unit for measuring angles, equal to 1/360 of a complete revolution.
• A unit of latitude or longitude, equal to 1/360 of a great circle.
• A unit for measuring temperature.
• The highest power or the sum of the powers of any term in a polynomial or by itself: x4 + x + 3 and xyz2 are of the fourth degree.
• The greatest power of the highest order derivative in a differential equation.

denominator   分母
The expression written below the line in a common fraction that indicates the number of parts into which one whole is divided. For example, 8 is the denominator of 5/8.

density   浓度; 密度

• The quantity of something per unit measure, especially per unit length, area, or volume.
• The mass per unit volume of a substance under specified conditions of pressure and temperature.

dependent event   相关事件，相依事件
Two events are dependent if the outcome or occurrence of the first affects the outcome or occurrence of the second so that the probability is changed.

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