常用词语和句式：
add / addition 加／加法
subtract / subtraction 减／减法
multiply / multiplication 乘／乘法
divide / division 除／除法
addend / augend 加数／被加数
minuend / subtrahend 被减数／减数
multiplier / multiplicand 乘数／被乘数
divisor / dividend 除数／被除数
numerator / denominator 分子／分母
sum / remainder / product / quotient 和／差／积／商
perform an operation 进行 1 次运算
find the root to three decimals 求根至 3 位小数
round off / count as one fractions more than 0.5 inclusive and cut away the rest 四舍五入
round up / down 按四舍五入法调高／调低为整数
reduce a fraction 约分
reduce fractions to a common denominator 通分
cancel the denominator 消去分母
raise a to the nth power 取 a 的 n 次方
extract the nth root of a 求 a 的 n 次根
rearrange the expression 重新排列表达式
bracket 加括号
remove parentheses 去括号
combine like terms 将同类项合并
take a factor outside 折出因子
remove a common factor 移出公因子，提取公因子
cancel common terms 消去同类项
factor (x2 - a2 ) 分解(x2 – a2 )的因子
substitute B into A 将 B 代入 A
substitute A by B / substitute B for A 以 B 代 A
establish a formula 列出方程式(公式)
solve the equation for x 解方程式求 x 的值
differentiate y with respect to x 对 x 求 y 的导数(微分)
differentiate a function implicitly 求一函数隐微分
graph a function 用图表示出函数
a added to b is / makes / equals c． a + b=c
a subtracted by b is c/b subtracted from a is c． a - b = c
a multiplied by b is c/a times b is c． a × b =c
a divided by / into b is c a÷ b = c
When a is added to / subtracted from / taken away from / multiplied by / divided by b , the
result / answer is c．若 a + b/a - b / a × b / a ÷ b ，则结果／答案是 c。
9 and 12 can be cancelled out by 3． 9 和 12 可用 3 来通约。
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