[DevPlan] 多项式乘法的改进
>> :mode
Calculating mode: polyn
>> (3x-x^6)2x
in> (3x-x^6)2x
out>
------------------------
>> (3x-x^6)*2x
in> (3x-x^6)*2x
out> -2x^7+6x^2
------------------------
>> 2x(3x-x^6)
in> 2x(3x-x^6)
out> -2x^7+6x^2
------------------------
>> (3x-x^6)(2x)
in> (3x-x^6)*(2x)
out> -2x^7+6x^2
------------------------
>> (3x-x^6)(2)x
in> (3x-x^6)*(2)x
out> 2x^1
------------------------
>> (3x-x^6)(2)
in> (3x-x^6)*(2)
out> -2x^6+6x^1
------------------------
>> (3x-x^6)(2)(x)
in> (3x-x^6)*(2)*(x)
out> -2x^7+6x^2
------------------------