英文中各种符号标点都怎么说

2x(-4)=-8你能用英语把这个等式(equation)读出来吗?被难倒了吧!别着急!看完下面双语君给你整理的`各种数学符号和标点符号的英文表达，你马上就会说了!

数学符号

Mathematical symbols

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