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师:我们已学习了分组后能直接提公因式的分解方法,下面进行分解因式比赛,看谁做得又快又好。(电脑屏幕上显示以下各式:(1)ac-ad+bc-bd;(2)ay~2-ax+bx-by~2;(3)5ax+6by+10ay+3bx;(4)5x~2+7a-7ax-5x;(5)x~2-y~2+ax+ay。待95%的学生做好后,教师请学生回答结果,并在屏幕上显示出过程、答案。)师:(1)～(4)能用上节课所学的分组后直接提公
Teacher: We have learned how to use the decomposition method directly after the grouping. The following factoring games will be conducted to see who can do it quickly and well. (The following are shown on the computer screen: (1)ac-ad+bc-bd; (2)ay~2-ax+bx-by~2; (3)5ax+6by+10ay+3bx; (4)5x ~2+7a-7ax-5x;(5)x~2-y~2+ax+ay. After 95% of the students are done, the teacher asks the students to answer the results and displays the process and answers on the screen.) Teacher: (1)～(4) Can directly use the group learned in the previous class