數(shù)學符號
Mathematical symbols
01
+: plus 加號；正號
“1+1”讀作：one plus one
02
－: minus; negative 減號；負號
“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)）。
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