常用的运算：
关于数学相关的英语推荐知乎的天道酬勤的回答。
https://www.zhihu.com/question/66185442/answer/239410292
1. addition加法 ①and②plus③add
Seven and / plus eight makes fifteen.
If you add ten to eight, you get eighteen.
2. subtraction减法①minus②from③take (away)(from)
Eight minus five is (leaves)three.
Ten take away four is six.
3 .multiplication乘法①times②multiplied by
Five times three is / equals fifteen.
Five multiplied by two equals ten
4 .division除法以4等于3。①divided by②into
Twelve divided by four makes three.
Four into twelve is three.
另外几分之几：
3/4 three fourths or three quarters
1/2 a half
1/4 one quarter
5. 正负
plus 加 positive 正 positive four
minus 减 negative 负
6. 指数
最常见的2^n：
two to the power of n.
two with exponential n.
the nth of power two.
10^n: ten to the power of N.
10^(-n):
ten to the negative nth power.
the negative nth power of ten.
7. 导数
dx/dT ：the first derivative of x with respect to T
first-order partial derivative 一阶偏导
Two-order-partial derivative 二阶偏导
8.符号
9 函数
10 矩阵
11 关于小数 point
0.4 zero point four
10.23 ten point two three
50％ fifty percent
0.12％ zero point one two percent
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