First, the general form of input-output equation has been given and a input-output difference equation corresponds to a class of canonical form has been obtained.
首先给出了输入输出方程的一般形式，并对于一类规范型给出了相应地输入输出差分方程。
Since the output of one industry (steel, for example) serves as an input for another (construction), one cannot solve any equation without solving them all simultaneously.
由于一个行业的产出总是会作为另一个行业的投入，因此除非能同时解出所有的方程，否则你一个也解不出。
Once upon, slover the root equation of a degree and equation of two degree that need input coefficient of equation, data separate need comma or space, output the root equation.
从前求一元一次方程和一元二次方程的根，要求输入方程的系数，数据间逗号或空格分隔，输出方程的根。
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