何忆捷,上海市延安中学高一学生。曾多次参加各级别的数学竞赛并获奖。这是他编拟的一套初中训练题,本期奉献给广大读者。我们佩服他的勇气,更为他的孜孜不倦而高兴。我们真诚希望有更多的在校学生的参与,将本刊办成所有数学竞赛爱好者的园地。 He Yijie, a high school student from Shanghai Yan’an Middle School. Has participated in various levels of math competitions and won awards. This is a set of junior high school training questions he has prepared for this issue dedicated to a wide range of readers. We admire his courage and he is more than happy to be tireless. We sincerely hope that more students will participate in the school and make this magazine a paradise for all math contest enthusiasts.