学习幂函数图象必须解决两大问题 :一是会作任意幂函数的图象 ;二是会由图象观察幂函数的性质 .但这历来是同学们学习的难点 .为此 ,我们介绍一种“观察———归纳”的方法 .1　观察“单”函数图象归纳“类”函数图象1.1　作出下列函数的图象 :① ｙ =ｘ2 ,② ｙ =ｘ3,③ ｙ = Learning the power function image must solve two major problems: one is to make an image of an arbitrary power function; the other is to observe the nature of a power function from the image. But this has always been a difficult point for students to learn. To do this, we introduce a The “observation—induction” approach.1 Observe the “single” function image to generalize the “class” function image 1.1 Make an image of the following function: 1 y =x2, 2 y =x3,3 y =