一元多项式简单计算器（1）输入并建立多项式

（2）输出多项式的类数学表达式，如x^15-8x^7-14（序列按指数降序排列）

（3）求多项式a的导函数a’

（4）多项式a和b相加，建立多项式a+b；

（5）多项式a和b相减，建立多项式a-b；

（6）多项式a和b相乘，建立多项式a*b；-A polynomial simple calculator (1) input and the establishment of a polynomial

(2) the mathematical expression of the output polynomials, such as x^15-8x^7-14 (sequence index in descending order)

(3) the derivative a of the polynomial a

(4) a and B are added together to establish a polynomial a+b

(5) a and b polynomial subtraction, a polynomial a-b

(6) a and B are multiplied by a polynomial a*b