2x(-4)=-8

你能用英語把這個等式（equation）讀出來嗎？

被難倒了吧！

別著急！看完下面雙語君給你整理的各種數學符號和標點符號的英文表達，你馬上就會說了！

數學符號
Mathematical symbols

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）。

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