[七年级下册人教版数学书108页1]1、解下列方程组 (1)3x-y=5……○1 5y-1=3x+5……○2 解：对○1式变形得 3x=y+5……○3 将○3式带入○1式得：5y-1=y+5+5……○4 将○4式变形得： 4y=11 所以：y=11/4 将y=11/4带入...+阅读
一提到英语背诵，许多同志们感到无从下手，现总结几条以帮助大家学习英语：
(1)反复阅读与再现相结合：单纯地反复阅读效果并不好，学习者应该在文章还没有完全记住前积极进行尝试再现，回忆不起来时再阅读。这样容易记住，而且保持时间也长。特别生疏的语句，注意多尝试再现几次。因为尝试再现是一种比阅读更积极的智力活动，又是一种自我检查的过程，使人更能集中精力，掌握识记内容的重点、难点，并及时改正记忆中的错误。
(2)试背：背诵过程中，如果出现“卡壳”，应该进行追忆。追忆是有意和间接再现的形式，它需要付出很大的意志力，克服一定的困难，多方面寻找线索，进行积极灵活的思维。因此，不能一“卡壳”，就立即停止背诵。
(3)熟背：文章通过理解消化，已纳入自己的知识系统，语句通过熟读试背，也已朗朗上口，如果再反复朗读几遍，就能流利地背诵下来。检查方式，除了个人和集体背诵外，还有对背，即两人面对面同时背诵，因为有对方干扰，可锻炼学生记忆的深刻性和正确性；提背，即打哪提，从哪背，提到哪，背到哪，可锻炼学生记忆的准确性。
(4)默写：这也是运用内部语言背诵的一种形式，既用脑，又动手，可加深对文章的记忆。一篇文章，就这样一段一段地把它“吃掉”。最后，遵循“整体→部分→整体”的原则，按照背诵各段的方法，再把全篇串联起来，进行背诵。
另外，为了使所背诵的内容长久地保持在头脑中，以便在实践中及时提取应用，学习者还应注意两点：
一是遵循遗忘规律，合理安排复习。既要有天天背诵检查，又要每周集中安排一次背诵检查。不断强化记忆痕迹，避免其减弱或消退。
二是根据识记程度对遗忘进程的影响，注意安排过度学习。实验表明，过度学习的效果优于适度学习的效果。所谓适度学习是指在识记材料刚刚达到背诵程度就中止的学习。而过度学习是指对识记材料达到背诵之后还继续进行学习。
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