专业外语作业----数学符号用英语怎么读

等数学符号用英语怎么读？
符号的英文读法

period 句号

≈ is approximately equal to 约等于号

, comma 逗号

＜is less than 小于号

：colon 冒号

＞ is more than 大于号
； semicolon 分号 B
≤ is not less than 不小于号

！ exclamation 惊叹号

≥ is not more than 不大于号

？question mark 问号

? is less than or equal to 小于或等于号

? is more than or equal to 大于或等于号

％ per cent 百分之…

‰per mill 千分之

∞ infinity 无限大号
＋plus 加号；正号

∩ intersection of 交，通集

－ minus 减号；负号

∫the integral of …的积分

± plus or minus 正负号

∑( sigma) summation of 总和

×is multiplied by 乘号

° degree 度

÷is divided by 除号

′ minute 分

＝ is equal to 等于

″ second 秒

≠is not equal to 不等于号

＃ number …号

≡ is equivalent to 全等于号

℃ Celsius system 摄氏度

≌ is equal to or approximately equal to 等于或约等于号

＠at 单价


1、
P
f
s
?
?
max
?
l

v

Told as:τ
max
is less than and equal to P over f
s ,
and equal to l over v.
2、
C
a D
?2.93
h
2
a
3
E

?
1
(1?
?
2
)
Told as:C
aD
is about two point nine three multiply h over a
3

to the second power and the root of E
over ρ
1
multiply the result of 1 minus σ to the second power.
3、
D
1
?D
2
?L
1
?L
2

Told as：the absolute value of D
1
minus D
2
is greater the absolute value of L
1
minus L
2.



?
?
x
1
?
k
?
? s
?
k
?
?n
1
?
k
?
4、?

?
?
x
2
?
k
?
??
s
?
k?D
?
?n
2
?
k
?
Told as:x
1
is the function of k equals s is the function of k plus n
1
is the function of k.x
2
is the
function of k equals as the quantity k minus D plus n
2
is the function of k.

d
2x
1
dx
x?x?x
3
5、
M
N1
2
?R
aN1
1
?
12
?p

dtdtC
aC1
Told as:M
N1
multiply the second derivative of x
1
with respect to t plus R
aN1
times the first
derivative of x
1
with

respect to t plus the value of x1 minus x
2
and minus x
3
over C
aC1
equals p.


6、
?
b2
0
B
2
(x)dx?Bm
l

Told as:the definite integral B
2
of x with limit from a to b over two with respect to x equals the
average value of B
m
multiply l.

?
h
ln
?< br>7、
B
1m
?
?
h?2(r?d)cos
?
2l
?
?
0
I
m
?
?
?

?
Told as:the average value of B
1m
equals the value of μo multiply I
m
over the value of two multiply l
times natural logarithmic function of h over the value h minus two times the value of r plus d and
times the absolute value cos?

?
2lB
1m
??< br>2lB
2m
?
4(r?d)
2
)
?
?
?
1?exp(?)
?
?
8、
?
1?exp(?

2
?
I
?
Ih
0m
?
0m
???
Told as:the value of one minus exponential negative two times l times the average B
1m
over μo
times I
m
to the second power multiply the value of one minus exponential negative two times l
times the average B
2m
over μo times I
m
to the second power equal four times the value of r plus d
to the second power over h to the second power.

n
?
?
n
l
i
d
?
i
B
i
l
i
(h?2x)B
4
(x) L
4
(x)d
?
H?dl????
9、
I
m
?
?

??
?
?
0
dS
?
0< br>i?1
?
0
?
r
dS
i?1
?
0< br>?
r
22
Told as:I
m
equals the closed liner integral H vector along l equals ∑ index i from 1 to n l
i
multiply
d multiply
?
i
over μ
o
multiply μ
r
multiply the differential of S plus L
4
of x multiply the differential
of
?
over μ
o
multiply the differential of S equals ∑ index i from 1 to n the value of B
i
times l
i
over
μ
o
multiply μ
r
plus the different value of h minus two times x then multiply B
4
of x over μ
o


10、Newton’s Law of Universal Gravitation
For particles, have masse
m
1
and
m
2
and are separated by a distance
r
, the force that each
exerts on the other is directed along the line joining the particles and has a magnitude given by
F?G
m
1
m
2
r
2

(Told as:the universal gravitation F equals the universal constant G multiply mass m
1
multiply
mass m
2
over r which is the distance between mass m
1
and

mass m
2
to the second
power . ）
The symbol
G
denotes the universal constant, whose value is found experimentally to be

G?6.67259?10
?11
N?m
2
k g
2

(Told as:the universal constant equals six point six seven two five nine multiply ten follow
negative eleven zeros unit newton times meter to the second power every kilogram to the second

power. )