以 o 开头的数学词汇 | 玄数

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.[1] 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.
三角形垂心 triangle high line

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.