“正推”与“反向思考”是一对孪生兄弟 ,有一天 ,他们为谁的作用更大吵了起来 ,跑来跟我理论 .我数学水平比较低 ,一时也难以定夺 ,遂与两兄弟一起到数学王国找答案 .数学王国大门紧闭 ,门上写着 ,要想通关 ,先做此题 ,题目如下 :对于一切实数x (x≠ 1 ) ,函数 f(x)有定义并满 “Pushing forward” and “reflexive thinking” are twin brothers. One day, the role they play for them is noisier. They come to follow me. My math is low and I can hardly decide for a moment. The brothers went to the mathematics kingdom to find the answer. The gates of the mathematics kingdom were closed and the door read. To make customs clearance, first do this question. The title is as follows: For all real numbers x (x≠ 1), the function f(x) is defined and full