同类项
- 网络like term;similar terms
同类项-
我用字母代替每一个空格，然后把整个等式列出来，再进行同类项合并。
How I got to it was assigning each blank to a letter and writing the whole thing as an equation then grouping like terms .
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将各变量按一定方式分割成较小的非负量，将变量替换后的多项式合并同类项，然后看是否所有的系数都是非负的。
The basic idea is : split the variables into smaller nonnegative quantities , then , collect the terms and see whether the coefficients all are nonnegative .
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题目有两个关键点：第一、识别多项式每一项的系数与指数；第二、对结果能很好的合并同类项。
There are two key questions : First , identify the polynomial coefficients and each of the index Second , the results can be a good merger of similar items .