数学课堂英语常用语

数学常用语[转帖]

分数
分数是fraction,读法有一定的规则，分子为基数词，分母为序数词。分子为1的时候可以读为a或one .
one-fifth/a fifth
分子（numeratror）基数词（cardinal number）,分母（denominator）是序数词（ordinal number）.
three-sevenths
分子的数字为2以上的时候，分母的序数词要加-s,变成复数形式。2/3为two-thirds
one half/a half
one-fourth/a fourth/one-quarter/aquarter seven and three-eighths
带分数（mixed fraction）要先读基数词，后面要加and .
three hundred fifteen over one thousand seven hundred fifty-four.
分数还有一种念法，因为复杂的分数序数词较难读，所以分子、分母都读成基数词，中间以（over）连接.

加法与减法
加法 addition
3+5=8 Three plus five equals/is/makes eight.
减法 subtraction
9-3=6 Nine minus three equals six.
398-241=157 three hundred ninety-eight minus two hundred forty-one equals/is one hundred fifty-seven
出现负数！ Oh,It came out megative!
4-5.6=-1.6 Four minus five point six equals negative (minus) one point six .

乘法与除法
乘法 multiplication
Six multiplied by seven equals forty-two.
除法 division
Fifteen divided by three equals five.
Two-sevenths divided by two-thirds equals three-sevenths.
出现余数！Oh! there's a remainder!
Ten divided by three equals three with remainder of one.

大数目和小数目
和外国人对话时，数字是最令人感到困扰的。因为英语的数字单位并没有中文"万"和"亿"。
523，000 five hundred and twenty-four thousand
英文中并没"万"这个单位，1万的话以10 thousand 来表示, hundred 后面的and,在美国通常被省略。
12，000，000 twelve million
100万为million
489,000,000 four hundred eighty-nine million
英语中并没有"亿"这个单位，1亿要说成100 million.
489,000,000,000 forty-eight billion
10亿的单位为billion但是美国才是如此表示，英国的billion 一般指"万亿"。要特别注意。
523，000，000，000，000 five hundred twenty-three trillion
"兆"为trillion,英语在"千"之后终于有个单位表示和中文一样了！
3．67 three point six seven
0.394 zero point three nine four/point three nine four

次方和根号
次方（power）开根号（root）.
x to the nth power.
x to the minus nth power .
five to the second power/five squared.
seven to the third power/seven cubed.
A squared plus b cubed equals c to the fourth power.
the nth root of x.
the square root of seven
the fifth root of four hundred thirth-two
the cube root of twenty-five

三角形 triangle
等边三角形 equilateral triangle
等腰三角形 isosceles triangle
直角三角形 right triangle
不等边三角形 scalene triangle
钝角三角

形 obtuse triangle
锐角三角形 acute triangle
立体图形
三棱柱 triangular prism
棱柱 prism
四面体 tetrahedron
圆锥 cone
球体 sphere
圆柱 cylinder/column
立方体 cube
棱锥 pyramid
展开图 development
圆和多边形
圆 circle
椭圆 oval
扇形 sector
四边形 quadrangle
正方形 square
长方形 rectangle
平行四边形 parallelogram
菱形 diamond/rhombus
梯形 trapezoid
五边形pentagon
六边形hexagon
七边形heptagon
八边形octagon
九边形nonagon
十边形decagon
式algebraic equation/formula/equation
方程式是equation.一次方程simple(linear) equation、二次方程 quadratic equation
三次方程 cubic equation
n次方程 nth-degree equation
请解答下列方程 Solve the following equations.
函数 function
一次函数linear function
二次函数quadratic function
因数 factor
因式分解 factorization
请用因式分解下列方程Factorize the following expressions.
整数integer/integral number
实数real number/actual number
最大公约数greatest common divisor/highest common factor
最小公倍数lowest common multiple
偶数even number
奇数odd number
四舍五入round off
定理theorem
宽度width
高度height/altitude
深度（长度）depth
比例proportion
***A与B成比例A is proportional to B
正比direct proportion
反比inverse proportion
重量weitht
面积area
体积volume
底边baes
顶点vertex/apex
圆周circumference
半径radius
直径diameter
切线tangential line/tangent
切点point of contact
角度angle
中心角center angle
直角right angle
内角interior angle
三角形内角总各为180度The sum of interior angles of a triangle is 180 degrees.
外角exterior angle
同位角corresponding angle
直线straight line
曲线surved line
抛物线parabola
垂线perpendicular line
平行线parallel line
对角线diagonal line
坐标coordinates
图形diagram
A is not equal to B.
A is greater than B
A is less than to B
A is greater than or equal to B
A is approximately equal to B
A is congruent to B
A is perpendicular to B
A is parallel to B
therefore/hence 所以