标题： 多项式加减乘

时 限： 5000 ms

内存限制： 8000 K

总时限： 10000 ms

描述： 多项式加减乘

有A，B，C…… n 个关于x的个多项式，求一个关于A，B，C……的多项式的结果

多项式的每一项之间用空格隔开，每一项的系数，x，指数之间也用空格隔开，系数为0的项不输出

输入： 基于多项式A，B，C……的运算表达式

关于x的多项式A

关于x的多项式B

关于x的多项式C

…

输出： 表达式的运算结果

含有A，B，C……表达式的运算结果，保留两位小数。

输出多项式表达式按指数降序排序

输入样例： (A+B)*(A-B)

A 1 x 2.1 3 x -3.09

B 2 x 1 2 x 0

输出样例： 1.00 x 4.20 -4.00 x 2.00 -8.00 x 1.00 -4.00 x 0.00 6.00 x -0.99 9.00 x -6.18







-Title: polynomial multiplication and subtraction

Time limit: 5000 ms

Memory Limit: 8000 K

Total time: 10000 ms

Descr iption: polynomial multiplication and subtraction

There are A, B, C ...... n a polynomial with respect to x, find a polynomial results for A, B, C ...... s

Each separated by a space between polynomials, each coefficient, also separated by a space between x, index, coefficient of entry 0 is not output

Input: Based on the polynomial A, B, C ...... arithmetic expression

A polynomial in x

About polynomial x B

C on the polynomial x

...

Output: The result of the expression

Operation result A, B, C ...... expression contained two decimal places.

The output index sorted in descending order polynomial expressions

Input Sample: (A+ B)* (A-B)

A 1 x 2.1 3 x-3.09

B 2 x 1 2 x 0

Sample output: 1.00 x 4.20-4.00 x 2.00-8.00 x 1.00-4.00 x 0.00 6.00 x-0.99 9.00 x-6.18