逆向思维是指按常规思维方式思考问题受阻时,转换思维角度,从问题的对立面思考的思维方法,常用于解决直接证明难以奏效的问题,是解决数学难题的一件有力武器.实例一五次方程的挑战早在公元前2000多年,巴比伦人就已经用“楔形文字”在泥板上记载下了一元二次方程的求根公式;到了9世纪,数学家阿尔·花拉子模给出了一般的一元二次方程的解法.16世纪,意 Reverse thinking refers to the way of thinking in the conventional way of thinking when the problem is obstructed, the way of thinking is changed, and the opposite of the problem is considered. It is often used to solve the problem that the direct proof is ineffective, and it is a powerful weapon to solve the mathematical problem. The challenge of the equation was as early as 2,000 BC. The Babylonians used the “cuneate character” to record the root formula of the one-dimensional quadratic equation on the clay slab; by the 9th century, the mathematician Al Falaura gave the formula. A general solution to the quadratic equation of one yuan. 16th century, meaning