2024年3月30日发(作者：高考模拟理科数学试卷)

实用文档

常用数学符号英文对照

Basic math symbols

Symbol Symbol Name Meaning / definition Example

=

≠

equals sign equality

5 = 2+3

5 is equal to 2+3

5 ≠ 4

5 is not equal to 4

not equal sign inequality

≈

approximately

equal

approximation

sin

(0.01) ≈ 0.01,

x

≈

y

means

x

is

approximately equal to

y

>

<

strict

inequality

strict

inequality

greater than

5 > 4

5 is greater than 4

4 < 5

4 is less than 5

5 ≥ 4,

less than

≥

inequality greater than or equal to

x

≥

y

means

x

is

greater than or equal to

y

4 ≤ 5,

≤

inequality less than or equal to

x ≤ y

means

x

is greater

than or equal to

y

2 × (3+5) = 16

( )

parentheses

[ ]

brackets

+

−

±

±

plus sign

calculate expression

inside first

calculate expression

inside first

[(1+2)×(1+5)] = 18

addition

1 + 1 = 2

minus sign subtraction

2 − 1 = 1

plus - minus

both plus and minus

operations

both minus and plus

operations

3 ± 5 = 8 and -2

minus - plus

3 ± 5 = -2 and 8

实用文档

*

×

·

÷

/

–

asterisk multiplication

2 * 3 = 6

times sign multiplication

2 × 3 = 6

multiplication

dot

division sign /

obelus

multiplication

2 · 3 = 6

division

6 ÷ 2 = 3

division slash division

6 / 2 = 3

horizontal line division / fraction

remainder calculation

decimal point, decimal

separator

mod

modulo

7 mod 2 = 1

2.56 = 2+56/100

.

period

a

b

power exponent

2= 8

3

a^b

caret

√

a

square root

3

exponent

2 ^ 3= 8

√

a ·

√

a = a

√9 = ±3

3

√

a

cube root

√

a

fourth root

√

a

(radical)

%

‰

percent

n-th root

√

a · √a ·

33

3

√a = a

4

√8 = 2

4

· √a ·

√a · √a =

√16 = ±2

a

44

4

√

a

4

n

for

n

=3,

n

√8 = 2

1% = 1/100 10% × 30 = 3

per-mille

1‰ = 1/1000 = 0.1% 10‰ × 30 = 0.3

1ppm = 1/1000000 10ppm × 30 = 0.0003

-7

ppm

per-million

ppb

per-billion

1ppb = 1/1000000000 10ppb × 30 = 3×10


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