（1）输入并建立一元多项式

（2）输出一元多项式

（3）多项式实现相加、相减及相乘

（4）输入多项式中的未知数，计算多项式的结果-(1) the input and the establishment of a polynomial

(2) output a polynomial

(3) to achieve additive, subtraction and multiplication of polynomials

(4) the input polynomial of unknown, the results of calculation of polynomial