著名数学家华罗庚曾说过:复杂的问题要善于“退”,足够的“退”,退到最原始而不失去重要性的地方,是学好数学的一个诀窍.许多同学在解数学题遇到困难时常常不知所措,这时我们不妨借鉴华罗庚教授“退”的思想,及时调整思维角度,从其它视角来审视同一个数学问题,那么有哪些“退” Huarong Geng, a famous mathematician, once said: Complex problems should be good at “retreat”, enough retreat, and retreating to the original place without losing the importance of learning mathematics. Many students encountered math problems When difficulties often do not know what to do, then we may wish to learn from Professor Hua Luogeng “back” thinking, timely adjustment of thinking point of view, from the other perspectives to examine the same mathematical problem, then what “back”