1.本单元重、难点分析本单元的重点:不等关系,不等式的基本性质(不等式变形的重要依据);一元二次不等式、二元一次不等式(组)的解法及应用;简单的线性规划问题;基本不等式a+b/2≥1/2ab(a≥0,b≥0).本单元的难点:不等式的基本性质的理解及应用;一元二次不等式的解法;简单的线性规划问题的求解;基本不等式a+b/2≥1/2ab(a≥0,b≥0)的灵活应用.2.典型例题选讲例1已知二次函数f(x)=ax2+bx+c,不 1. The unit is heavy and difficult to analyze the focus of the unit: Unequal relationship, the basic nature of inequality (an important basis for inequality deformation); unary quadratic inequality, binary inequality (group) solution and application; simple linear programming The basic inequality a + b / 2≥1 / 2ab (a ≥ 0, b ≥ 0). The difficulty of this unit: the basic nature of the inequality understanding and application; solution of a quadratic quadratic inequality; simple linear programming problem (A≥0, b≥0) .2. Typical Example Selection Example 1 Known quadratic function f (x) = ax2 + bx + c, Do not