开口惊艳你的数学老师符号英文如何表达
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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