有些数学问题看似无从入手,直接解又比较困难.这时,我们不妨把这个数学问题转化成它的等价命题,以此为切入点进行解答,问题不仅能化难为易,而且方法简洁巧妙,下面举例说明. Some mathematical problems seem to be impossible to start direct solution is more difficult .At this time, we may wish to turn this mathematical problem into its equivalent proposition, as a starting point to answer, the problem can not only difficult as easy, but the method is concise and clever Here’s an example.