秉笔直书教学反思

以下是11到25各数的平方：

$11^2 = 11×11 = 121$

$12^2 = 12×12 = 144$

$13^2 = 13×13 = 169$

$14^2 = 14×14 = 196$

$15^2 = 15×15 = 225$

$16^2 = 16×16 = 256$

$17^2 = 17×17 = 289$

$18^2 = 18×18 = 324$

$19^2 = 19×19 = 361$

$20^2 = 20×20 = 400$

$21^2 = 21×21 = 441$

$22^2 = 22×22 = 484$

$23^2 = 23×23 = 529$

$24^2 = 24×24 = 576$

$25^2 = 25×25 = 625$