数学运算符号的英文表达数学运算符号的英文表达
小数、分数、百分数和运算符号小数、分数、百分数和运算符号
1. 小数表示法小数表示法
(1) 小数的读法小数的读法
小数点左边的数通常按基数词读,小数点左边的数通常按基数词读,若为三位以上的数,若为三位以上的数,也可按编码式读法读出,即将数字单个读出;小数点右边的数通常按编码式读法单个读出。如:个读出;小数点右边的数通常按编码式读法单个读出。如:
6.86 six point eight six
14.15 fourteen point one five
345.456 three four five point four five six
或three hundred and forty -five point four five six
(2) 小数中“0”的读法的读法
“0”在小数中通常读作nought (英)或zero (美),也可读作字母o 。如:。如:
0.08 (nought )point nought eight 或 (zero )point zero eight
9.07 nine point o seven
2. 百分数表示法百分数表示法
百分数中的百分号%读作percent 。如:。如:
6% 读作读作 six percent
0.6% 读作读作 (nought ) point six percent
500% 读作读作 five hundred percent
3. 倍数表示法倍数表示法
倍数表示方法很多,如:倍数表示方法很多,如:
This room is four mes as big as mine. 这个房间是我房间的四倍。这个房间是我房间的四倍。
This room is three mes larger than that one. 这个房间比那个房间大两倍。这个房间比那个房间大两倍。
The output of coal has doubled. 煤的产量增加了一倍。煤的产量增加了一倍。
My aunt is as old again as I am. 我姑姑年龄比我大一倍。我姑姑年龄比我大一倍。
Produc vity is increased three fold. 生产效率提高了两倍。生产效率提高了两倍。
The volume of the Sun is about 1,300,000 mes that of the Earth.
太阳的体积约为地球的1300000倍。倍。
4. 加减乘除式的读法加减乘除式的读法
6+5=11 Six plus five is eleven 或 Six and five is eleven.
11-6=5 Eleven minus six is five. 或 Six from eleven is five.
4×5=20 Four mul plied by five is twenty.或 Four mes five is twenty.
20÷4=5 Twenty divided by four is five. 或 Four into twenty goes five.
15:5=3 The ra o of fi een to five is three.
32 Three squared is nine.
23 Two cubed is eight.
24 The fourth power of two is sixteen.
X^(1X^(1//2)=Y The square root of X is Y .
X^(1X^(1//3)=Y The cubic root of X is Y .
a > b a is more than b.
a < b a is less than b.
a ≈ b a approximately equals to b. a ≠ b a is not equal to b.
5. 分数表示法分数表示法
(1) 较小分数的一般读写方法。如:较小分数的一般读写方法。如:
1/3 one-third 2/3 two-thirds 3/5 three-fi hs
(2) 较复杂分数的简明读写方法。如较复杂分数的简明读写方法。如
22/9 twenty-two over nine
a/b a over b 或 a divided by b 43
/97 forty-three over ninety-seven
(3) 整数与分数之间须用and 连接。如:连接。如:
four and a half nine and two fi hs
(4) 分数用作前置定语时,分母要用单数形式。注意下列写法与读法。如:分数用作前置定语时,分母要用单数形式。注意下列写法与读法。如:
a one-third mile 1/3英里英里 a three-quarter majority 3/4的多数的多数
常用标点符号用法常用标点符号用法
常用缩略语表常用缩略语表
. period period 句号句号
, comma comma 逗号逗号
: colon colon 冒号冒号
; semicolon semicolon 分号分号
! exclama on exclama on 惊叹号惊叹号
ques on mark 问号问号
 ̄ hyphen hyphen 连字符连字符
' ' apostrophe apostrophe 省略号;所有格符号省略号;所有格符号
— dash dash 破折号破折号
‘’ ‘’ single quota on marks 单引号单引号
“” “” double quota on marks 双引号双引号
( )parentheses 圆括号圆括号
[] [] square brackets 方括号方括号
《》《》 French quotes 法文引号;书名号法文引号;书名号 ... ... ellipsis ellipsis 省略号省略号
¨ tandem colon 双点号双点号
" " di o di o 同上同上
‖ parallel parallel 双线号双线号
/ virgule virgule 斜线号斜线号
& ampersand = and
~ swung dash 代字号代字号
§ § sec on sec on
; → → arrow arrow 箭号;参见号箭号;参见号
+ plus plus 加号;正号加号;正号
- minus minus 减号;负号减号;负号
± ± plus or minus 正负号正负号
× × is mul plied by 乘号乘号
÷ ÷ is divided by 除号除号
= is equal to 等于号等于号
≠ ≠ is not equal to 不等于号不等于号
≡ is equivalent to 全等于号全等于号
≌ is equal to or approximately equal to 等于或约等于号等于或约等于号
≈ ≈ is approximately equal to 约等于号约等于号
< is less than 小于号小于号
> is more than 大于号大于号
≮ is not less than 不小于号不小于号
≯ is not more than 不大于号不大于号
≤ ≤ is less than or equal to 小于或等于号小于或等于号
≥ ≥ is more than or equal to 大于或等于号大于或等于号
% per cent 百分之…
‰ ‰ per mill 千分之…
∞ ∞ infinity infinity 无限大号无限大号
∝ varies as 与…成比例成比例
√ √ (square) root 平方根平方根
∵
since since ; ∴ hence hence 所以所以
∷
equals equals , ∠ angle angle 角
≲ semicircle semicircle 半圆半圆
≰ circle circle 圆
○ circumference circumference 圆周圆周
π π pi pi 圆周率圆周率
△ triangle triangle 三角形三角形
≱ perpendicular to 垂直于垂直于
∪ union of 并,合集并,合集
∩ intersec on of 交,通集交,通集
∫ ∫ the integral of …的积分的积分
∑ ∑ (sigma) summa on of 总和总和 ° degree degree 度
′ minute minute 分
″ second second 秒
#
number number …号 ℃ Celsius system 摄氏度摄氏度
@ at at 单价单价
标点符号和运算符号标点符号和运算符号
常用标点符号用法常用标点符号用法
句号句号 Period
用以表示一个句子的结束用以表示一个句子的结束
Hockey is a popular sport in Canada.
The federal government is based in O awa.
用在缩写中用在缩写中
semicircleB.C. is the province located on the West Coast.
Dr. Bethune was a Canadian who worked in China.
The company is located at 888 Bay St. in Toronto.
It is 4:00 p.m. in Halifax right now.
问号问号 Ques on Mark [?]
在句子的结尾使用问号表示是直接疑问句:在句子的结尾使用问号表示是直接疑问句:
How many provinces are there in Canada?
注意:在间接疑问句结尾不要加问号:注意:在间接疑问句结尾不要加问号:
The teacher asked the class a ques on.
Do not ask me why.
叹号叹号 Exclama on Mark [!]
在句子的结尾使用叹号表示惊讶、兴奋等情绪:在句子的结尾使用叹号表示惊讶、兴奋等情绪:
We won the Stanley Cup!
The forest is on fire!
逗号 Comma [,]
逗号
句子中的停顿
句子中的停顿
Therefore, we should write a le er to the prime minister.
在疑问句中引出说话人:
在疑问句中引出说话人:
"I can come today," she said, "but not tomorrow."
排列三个或以上的名词:
排列三个或以上的名词:
Ontario, Quebec, and B.C. are the three biggest provinces.
引出定语从句
引出定语从句
Emily Carr, who was born in 1871, was a great painter.
单引号 Apostrophe [']
单引号
表示所有
表示所有
This is David's computer.
These are the player's things. (things that belong to the player)
Note: 对于复数形式的名词,只加'
These are the players' things. (things that belong to the players)
缩写I don't know how to fix it.
引号Quota on Marks ["]
直接引出某人说的话:
直接引出某人说的话:
The prime minister said, "We will win the elec on."
"I can come today," she said, "but not tomorrow."
冒号Colon [:]
引出一系列名词
引出一系列名词
There are three posi ons in hockey: goalie, defence, and forward.
引出一个较长的引语
引出一个较长的引语
The prime minister said: "We will fight. We will not give up. We will win the next elec on." 分号Semicolon [;]
将两个相关的句子连接起来
将两个相关的句子连接起来
The fes val is very popular; people from all over the world visit each year.
和逗号一同使用引出一系列名词
和逗号一同使用引出一系列名词
The three biggest ci es in Canada are Toronto, Ontario; Montreal, Quebec; and Vancouver, B.C.
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