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重点难点易混易错点剖析复习重点:根据不等式的基本性质解不等式,解一元一次不等式和一元一次不等式组,利用数轴表示不等式(组)的解集,用不等式(组)解决实际问题.复习难点:根据不等式的基本性质对不等式进行变形,在解决实际问题中如何正确列出不等式(组).易混易错点:(1)解不等式组的一般步骤:先求出各个不等式的解集,再在数轴上表示出解集的公共部分,最后写出不等式组的解集.
Key points: easy to be mixed and easy to be wrong. Point-by-point analysis Focus: According to the basic properties of the inequality solution inequalities, solve the unary inequality and the unary inequality group, use the axis to represent the set of inequalities, and solve the practical problems with inequality. Difficulties: According to the basic nature of inequality to transform the inequality, how to correctly list the inequality (group) in solving practical problems.Mixed misunderstandings: (1) The general steps to solve the inequality group: first find the solution set of each inequality , And then on the axis shows the common part of the solution set, and finally write the solution set of inequality group.