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）
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