Under definite conditions, comparing two linear models with linear equality constraints, some simple necessary and sufficient conditions is obtained.
在一定条件下，比较带有线性等式约束的两个线性模型，得到了几个简洁的充要条件。
In this paper, the solution for a kind of variables separated first-order ODE is studied, and a simple method under some conditions is given.
研究了一类可变量分离方程的求解方法，并给出了在满足一定条件下求解这类方程更简单的方法。
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