2x（-4）=-8，你能用英語把這個等式（equation）讀出來嗎？被難倒了吧！如果還有波形符號、立方根、函數(shù)表達(dá)等，你是不是心慌了呢？別著急！下面給你整理歪果仁如何表達(dá)各種數(shù)學(xué)符號和標(biāo)點符號，看完后你馬上就會說了~~
Mathematical symbols 數(shù)學(xué)符號
01. +: plus 加號;正號
“1+1”讀作：one plus one
02. -: minus; negative 減號;負(fù)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(fù)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(shù)），k是常數(shù)。
“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(shù)）
（來源：英語天天練）
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