﻿ ﻿﻿﻿ 以 a 开头的数学词汇 | 玄数
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## 以 a 开头的数学词汇

2012-10-05
abacus   算盘
A frame with small balls which slide along wires. It is used as a tool or toy for counting. abscissa  横坐标
In plane Cartesian coordinates, the x-coordinate of a point: its position from the origin (y axis) measured parallel to the x-axis. absolute value  绝对值
The absolute value of a real or complex number is the distance from that number to the origin. For any real number x the absolute value or modulus of x is denoted by |x|. acre  英亩
Exactly equal to 1⁄640 of a square mile, about 4,046 m2.

acute angle  锐角
The angle is smaller than a right angle (less than 90°) acute triangle  锐角三角形
A triangle with all interior angles measuring less than 90° add  加
Put numbers or amounts together to get a total. The signal is “+”.

addend  加数
An addend number which is involved in addition. Numbersbeing added are considered to be the addends.

addition  加法；增加
The process of adding two or more numbers together to find their total. 1+1=2, 5+8=13.

additive identity  加法恒等元,加法单位元
When added to any element x in the set, yields x. Usually the sum of the number x and 0 yields the same number.

additive inverse  加性逆元
The opposite of a number. For example, the additive inverse of 12 is -12.

adjacent  邻近的

adjacent angles  邻角
Two angles are adjacent when they have a common side and a common vertex (corner point), and don’t overlap. adjoint matrix 伴随矩阵
The adjoint of a square matrix A, is the transpose of the matrix of cofactors of A. ﻿