我们学过幂的运算性质后,对性质的正向运用一般比较熟练,但把它们反过来活用却往往不习惯.其实,逆用幂的运算性质能使许多问题化难为易.在学习中若能经常进行“反过来想一想”“倒过来用一用”……等逆向思维的活动,不仅能加深对这些性质的理解和运用,而且还能培养同学们的创新意识和创新能力,下面看几个例子 After we learn about the nature of exponentiation, the positive use of properties is generally more proficient, but it is often unaccustomed to use them in reverse. In fact, the nature of the inverse powers can make many problems difficult to understand. The activities of “thinking in reverse” and “using it in reverse” to reverse thinking often can not only deepen the understanding and application of these qualities, but also cultivate students’ innovative awareness and innovative ability. Look at a few examples