开口惊艳你的数学老师，符号英文如何表达？

【来源：易教网 更新时间：2018-01-16】

2x(-4)=-8，你能用英语把这个等式（equation）读出来吗？被难倒了吧！

如果还有波形符号、立方根、函数表达等，你是不是心慌了呢？

别着急！

下面给你整理歪果仁如何说的各种数学符号和标点符号的英文表达，看完后你马上就会说了！

Mathematical symbols 数学符号

01 +: plus 加号；正号

“1+1”读作：one plus one

02 －: minus; negative 减号；负号

“2-1”读作：two minus one

“-3”读作：minus three或negative three

“2-(-3)”读作：two minus negative three

03 ±: plus-minus sign 正负号

“±1” 读作：plus or minus one

04 ×: multiplied by ;times 乘号

“2×3” 读作：two multiplied by three 或 two times three

05 ÷: divided by 除号

“4÷2”读作：four divided by two

06 =: equals; is equal to 等于号

“1+1=2”读作：One plus one equals two. 或 One plus one is equal to two.

07 ≠: is not equal to 不等于号

“a≠b”读作：a is not equal to b

08 ≌: congruent to 全等（两个图形形状相同、大小相等）

“△ABC≌△DEF”读作：Triangle ABC is congruent to Triangle DEF.

09 ≈: approximately equal to 约等于号

“3×3≈10” 读作：Three multiplied by three is approximately equal to ten.

10 <: is less than 小于号

“1<2”读作 One is less than two.

11 >: is greater than 大于号

“2>1”读作：Two is greater than one.

12 ≮: is not less than 不小于号

“3≮2”读作：Three is not less than two.

13 ≯: is not greater than 不大于号

“2≯4” 读作：Two is not greater than four.

14 ≤: is less than or equal to 小于或等于号

“2≤3”读作：Two is less than or equal to three.

15 ≥: is greater than or equal to 大于或等于号

“5≥4”读作：Five is greater than or equal to four.

16 %: percent 百分之……

“10%”读作：ten percent

17 ‰ : per mill ;per thousand 千分之……

“10‰”读作：ten per thousand

18 ∞: infinity 无限大号

“－∞” 读作：negative infinity

19 ∝: varies as 与...成比例

“X∝Y”读作：X varies as Y

20 √￣: square root 平方根

“√￣16=4”读作：The square root of sixteen is four.

21 3√￣: cube root 立方根

“3√￣27=3”读作：The cube root of 27 is 3.

22 ∵: since; because 因为

“∵1+1=2”读作：because one plus one equals two

23 ∴: hence; therefore 所以

“∴1<2”读作：hence one is less than two

24 ∠: angle 角

“∠A”读作：angle A

“∠A +∠B+∠C=180°” 读作：The measure of angle A plus angle B plus angle C equals 180 degrees.

25 ⌒: semicircle 半圆

“⌒AB”读作：semicircle AB

26 ⊙: circle 圆

“⊙A”读作：circle A

27 ○: circumference 圆周

“○=π×d”读作：Pi multiplied by d equals circumference.

28 π: pi constant 圆周率

“π×d”读作：pi multiplied by d

29 △: triangle 三角形

“△ABC”读作：triangle ABC

What is the area of triangle ABC? 求三角形ABC的面积。

30 ⊥: perpendicular to 垂直于

“A⊥B”读作：A is perpendicular to B.

31 //: parallel to 平行于

Line AB is parallel to line CD.

32 ∪: union of 并，合集

“A∪B”读作：the union of A and B

33 ∩: intersection of 交，通集

“A∩B”读作：The intersection of A and B

34 ∫: the integral of ……的积分

“∫x”读作：the integral of x

35 ∑: summation of 总和

“∑x”读作：the summation of x

36 equation 方程式、等式

“y = kx” 读作：Y varies as x.

K is "the constant of variation. y与x成正比（y是x的正比函数），k是常数。

“y = k/x”读作：Y varies inversely as x. y与x成反比例（y是x的反比例函数）。

Punctuation marks 标点符号

° degree 度

′ minute 分

″ second 秒

℃ Celsius degree 摄氏度

℉ Fahrenheit degree 华氏度

@ at sign

{ } curly brackets 波形括号

[ ] square brackets 方括号

（ ）parentheses ;brackets; round brackets 括号

( open parenthesis 左括号

)close parenthesis 右括号

. point/dot 点

| vertical barvertical virgule 竖线

& ampersand; and; reference; ref 和，引用

* asterisk, multiply, star, pointer 星号，乘号，星，指针

/ slash; divide; oblique; stroke; solidus 斜线，斜杠，除号

// slash-slash; comment 双斜线，注释符

# number sign; pound sign; hash 井号

\ backslash 反斜线转义符

~ tilde 波浪符

。full stop; period 句号

, comma 逗号

: colon 冒号

semicolon 分号

question mark 问号

! exclamation mark 惊叹号

' apostrophe 撇号、所有格符号