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美国著名数学教育家波利亚曾经说过:一个专心的认真备课的教师能够拿出一个有意义的但又不太复杂的问题去帮助学生发掘问题的各个方面.使
The famous math educator of the United States, Polya, once said that a dedicated teacher who prepares lessons seriously can come up with a meaningful but not too complicated problem to help students find all aspects of the problem.