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试题1(江西卷,理科第3题)若 a>0,b>0,则不等式-b<1/x1/bD.x<-1/b或x>1/a试题特点:从同解变形即是等价变形的角度考查了解不等式.思路分析:1.求解对照,过程略.2.将 a、b 特殊化为具体数字,如令 a=b=1,解后对照选项.3.从数形结合的角度考虑.分别作 y=-b,y=a,y=1/x 的图象(图略),可知选 D.方法小结:函数、方程、不等式密不可分.
Problem 1 (Jiangxi Volume, Science Question 3) The inequality -b <1 / x 0, b> <1 / aB.-1 / a 1 / bD.x <-1 / b or x> 1 / a test questions Features: Equivalent deformation perspective to understand the inequality. Analysis of ideas: 1. Solve the control, the process is slightly. 2. A, b specialization for the specific figures, such as a = b = 1, solution after the control options. Considering the combination of point of view, respectively, as y = -b, y = a, y = 1 / x image (Figure omitted), we can see that D. Method summary: Functions, equations, inequalities are inseparable.