数学符号念读

Mathematics Symbols and Their English Explanations

1/2 a half or one half

1/3 a third or one third

2/3 two third

1/4 a quarter or one quarter; a fourth or one fourth

1/10 a tenth or one tenth

1/100

a [one] hundredth 1/1000

a [one] thousandth 1/1234

one over a thousand two hundred and thirty-four 3/4

three fourths or three quarters 4/5

three fifths or four over five 113/300

one hundred and thirteen over three hundred 21

2

two and a half 87

2

two and seven over eight or two and seven eighths 81

3

three and one eighth 31

4

four and a third 43

125

a [one] hundred twenty-five and three fourths [quarters] 0.1(or .1)

0 point one or zero point one or nought point one 0.01(or .01)

0 point 0 one or zero point zero one or nougth point nought one 0.25(or .25)

nougth point two five or point two five 0.045

decimal [point] nought four five 2.35

two point three five 4.9

four point nine recurring 3.0362

three point nought three two six , two six recurring 45.67

four five [forth-five] point six seven 38.72

three eight point seven two or thirty-eight decimal seven two

0.001(or .001) 0 point 0 0 one nought point nought nought one or zero point

zero zero one or point nought nought one

+ plus; positive

_ minus; negative

±plus or minus

⨯(or.) multiplied by ; times

÷(or/) divided by

= is equal to ; equals

≡is identically equal to

≈(or≅;Ω;=) is approximately equal to ; approximately equals

≡identical with

= or ≠not equal to

→or= approaches

< less than

greater than

<< much less than

>> much greater than

≤equal to or less than

≥equal to or greater than

( ) round brackets; parentheses

[ ] square brackets

[ ] angular brackets

{ } braces

⋂intersection

⋃union

∈is member of set

⊂is a subset of

~ similar to ; difference

* denotes an operation

⇔is equivalent to

⇒implies

{ }or∅empty set

→maps into

∴therefore

because

: ratio sign, divided by, is to

:: equals, as (proportion)

∝varies as

∞infinity

square root of

3cube root of

║ parallel to

。degrees

, minutes

” seconds

∠angle

AB length of line from A to B

A⨯B vector product of A and B; magnitude of A times magnitude

of B times sine of the angle from A to B; AB sin AB

A B

∙scalar product of A to B ; magnitude of A times magnitude

of B times cosine of the angle form A to B ;AB cos AB

I or j imaginary or square root of -1

ωor 2ωthe imaginary cube roots of 1

πpi ; the ratio of the circumference of a circle to its diameter,

approx.3.14159

e or ε①the base o

f natural logarithms, approx.2.71828