开口惊艳你的数学老师：符号英文如何表达？

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表达各种数学符号和标点符号，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）

（来源：英语天天练）