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１ 创设情境，铺垫引入Ｔ：我们能把双曲线 ｘ２１６－ｙ２９＝１画出来吗？Ｓ：能画出来．Ｔ：能画得比较精确一点吗？（学生默然）Ｔ：通过列表描点，我们能把双曲线的顶点及附近的点，比较精确地画出来，但双曲线向何处伸展就不很清楚了．然而，给出中心也在原点，对称轴
1 Create a situation, starting to introduce T: Can we draw the hyperbolic x216-y29=1? S: I can draw it. T: Can you draw more accurately? (students are silent) T: By plotting the list, we can draw the vertices of the hyperbola and the nearby points more accurately, but the extension of the hyperbola is not very clear. However, given that the center is also at the origin, the symmetry axis