﻿ ﻿﻿﻿ 以 o 开头的数学词汇 | 玄数
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## 以 o 开头的数学词汇

2012-10-07
oblique   倾斜

• Sloping or joining something at an angle that is not a right angle.
• Neither perpendicular nor parallel to another line or plane.

oblong   长方形的,矩形的；椭圆形的
Having the shape of or resembling a rectangle or ellipse.

obtuse angle   钝角
An angle greater than 90° and less than 180°. obtuse triangle   钝角三角形
A triangle with one obtuse angle. octagon   八边形
A polygon with eight sides and eight angles.

octahedron   八面体
A polyhedron with eight faces.

odd   奇数的

• Not divisible by two.
• Changing sign but not absolute value when the sign of the independent variable is changed, as in y = x3.

odd number   奇数
Designating an integer not divisible by two, such as 1, 3, and 5.

odometer   里程表
An instrument that indicates distance traveled by a vehicle.

open sentence   开命题,真伪未定的命题
An expression that contains at least one unknown quantity and becomes true or false when a test value is substituted for the unknown.

operation   运算
A process or action, such as addition, substitution, transposition, or differentiation, performed in a specified sequence and in accordance with specific rules.

operator   运算符
A symbol for expressing a mathematical operation.Such as +, -, ×,÷

order   排序
A condition of logical or comprehensible arrangement among the separate elements of a group.

order of operations   操作顺序
A collection of rules that reflect conventions about which procedures to perform first in order to evaluate a given mathematical expression. For example, in mathematics and most computer languages, multiplication is granted a higher precedence than addition. Thus, the expression 2 + 3 × 4 is interpreted so as to have the value 14, not 20.

ordered pair   有序对
An ordered pair (a, b) is a pair of objects. The order in which the objects appear in the pair is significant: the ordered pair (a, b) is different from the ordered pair (b, a) unless a = b. In contrast, the unordered pair {a, b} equals the unordered pair {b, a}.

ordinal number   序数词
A number indicating position in a series or order. The ordinal numbers are first (1st), second (2nd), third (3rd), and so on.

ordinate   纵坐标
In plane Cartesian coordinates, the y-coordinate of a point: its distance from the x-axis measured parallel to the y-axis.

origin   原点
The point of intersection of coordinate axes, as in the Cartesian coordinate system.

orthocenter   垂心
The point of intersection of the three altitudes of a triangle. ounce   盎司
A unit of weight in the US Customary System, an avoirdupois unit equal to 437.5 grains (28.35 grams).

outlier   离群值；异常值
An observation that is well outside of the expected range of values in a study or experiment, and which is often discarded from the data set,

oval   椭圆形, 卵形
An egg-shaped or elliptical form or figure.

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