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通过一道以二次函数不等式恒成立为条件的三元最值问题,多角度多方位研究这道题目的多种解法,并从中寻找简单自然的解法.
Through a multi-angle multi-angle multi-angle multi-angle solution to the problem of ternary value, which is conditional on the quadratic function inequalities, a variety of solutions to this problem are studied and a simple and natural solution is sought.