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一次函数在函数家族中占有重要的地位,也是中考中经常出现的考点.在许多综合性的压轴题中,常常用到一次函数的知识.不仅如此,每年的中考中还会出现一些设计新颖、背景独特的新题型.为了方便同学们及时了解一次函数在中考中的新动向,现归纳几种情况供参考.一、求值例1(2012年·苏州)点(m,n)在函数y=2x+1的图象上,则2m-n的值是().A.2 B.-2 C.1 D.-1分析:依题意,可将已知点代入解析式,经过适当的变形即可解决问题.
First-order function occupies an important position in the function family, but also frequently used in middle school entrance examination sites in many comprehensive finale questions, often use a knowledge of the function. Not only that, there will be some in the annual test in the design of some novel, The background of a unique new type. In order to facilitate students to keep abreast of a function in the test in the new trend, are summarized for several situations for reference. Evaluation Example 1 (2012 · Suzhou) point (m, n) in the function y = 2x + 1, the value of 2m-n is () .A.2 B.-2 C.1 D.-1 Analysis: According to the intended purpose, the known point can be substituted into the analytical expression, Proper deformation can solve the problem.