对于解集非空的一元二次不等式的求解 ,我们常用“两根之间”、“两根之外”这类简缩语来说明其结果 ,同时也表明了它的解法 .这是用“等”来解决“不等”的一个典型例子 .从表面上看 ,“等”和“不等”是对立的 ,但如果着眼于“等”和“不等”的关系 ,会发现它们之间相互联系? For the solution of a solution to a non-empty unary quadratic inequality, we often use the acronym “between two roots” and “two outsides” to illustrate the result and also indicate its solution. A typical example of solving the problem of “inequalities.” On the surface, “such as” and “inequalities” are antagonistic, but if one looks at the relationship between “equal” and “inequalities,” they will find mutual relations between them. contact?