開口驚艷你的數學老師，符號英文如何表達？

【來源：易教網 更新時間：2018-01-16】

2x(-4)=-8，你能用英語把這個等式（equation）讀出來嗎？被難倒了吧！

如果還有波形符號、立方根、函數表達等，你是不是心慌了呢？

別著急！

下面給你整理歪果仁如何說的各種數學符號和標點符號的英文表達，看完后你馬上就會說了！

Mathematical symbols 數學符號

01 +: plus 加號；正號

“1+1”讀作：one plus one

02 －: minus; negative 減號；負號

“2-1”讀作：two minus one

“-3”讀作：minus three或negative three

“2-(-3)”讀作：two minus negative three

03 ±: plus-minus sign 正負號

“±1” 讀作：plus or minus one

04 ×: multiplied by ;times 乘號

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

05 ÷: divided by 除號

“4÷2”讀作：four divided by two

06 =: equals; is equal to 等于號

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

07 ≠: is not equal to 不等于號

“a≠b”讀作：a is not equal to b

08 ≌: congruent to 全等（兩個圖形形狀相同、大小相等）

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

09 ≈: approximately equal to 約等于號

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

10 <: is less than 小于號

“1<2”讀作 One is less than two.

11 >: is greater than 大于號

“2>1”讀作：Two is greater than one.

12 ≮: is not less than 不小于號

“3≮2”讀作：Three is not less than two.

13 ≯: is not greater than 不大于號

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

14 ≤: is less than or equal to 小于或等于號

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

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

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

16 %: percent 百分之……

“10%”讀作：ten percent

17 ‰ : per mill ;per thousand 千分之……

“10‰”讀作：ten per thousand

18 ∞: infinity 無限大號

“－∞” 讀作：negative infinity

19 ∝: varies as 與...成比例

“X∝Y”讀作：X varies as Y

20 √￣: square root 平方根

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

21 3√￣: cube root 立方根

“3√￣27=3”讀作：The cube root of 27 is 3.

22 ∵: since; because 因為

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

23 ∴: hence; therefore 所以

“∴1<2”讀作：hence one is less than two

24 ∠: angle 角

“∠A”讀作：angle A

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

25 ⌒: semicircle 半圓

“⌒AB”讀作：semicircle AB

26 ⊙: circle 圓

“⊙A”讀作：circle A

27 ○: circumference 圓周

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

28 π: pi constant 圓周率

“π×d”讀作：pi multiplied by d

29 △: triangle 三角形

“△ABC”讀作：triangle ABC

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

30 ⊥: perpendicular to 垂直于

“A⊥B”讀作：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”讀作：the union of A and B

33 ∩: intersection of 交，通集

“A∩B”讀作：The intersection of A and B

34 ∫: the integral of ……的積分

“∫x”讀作：the integral of x

35 ∑: summation of 總和

“∑x”讀作：the summation of x

36 equation 方程式、等式

“y = kx” 讀作：Y varies as x.

K is "the constant of variation. y與x成正比（y是x的正比函數），k是常數。

“y = k/x”讀作：Y varies inversely as x. y與x成反比例（y是x的反比例函數）。

Punctuation marks 標點符號

° degree 度

′ minute 分

″ second 秒

℃ Celsius degree 攝氏度

℉ Fahrenheit degree 華氏度

@ at sign

{ } curly brackets 波形括號

[ ] square brackets 方括號

（ ）parentheses ;brackets; round brackets 括號

( open parenthesis 左括號

)close parenthesis 右括號

. point/dot 點

| vertical barvertical virgule 豎線

& ampersand; and; reference; ref 和，引用

* asterisk, multiply, star, pointer 星號，乘號，星，指針

/ slash; divide; oblique; stroke; solidus 斜線，斜杠，除號

// slash-slash; comment 雙斜線，注釋符

# number sign; pound sign; hash 井號

\ backslash 反斜線轉義符

~ tilde 波浪符

。full stop; period 句號

, comma 逗號

: colon 冒號

semicolon 分號

question mark 問號

! exclamation mark 驚嘆號

' apostrophe 撇號、所有格符號