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第十三讲等差数列初步练习6
(1)有一个7层书架共放了679本书，上层比下层少5本，最上层放几本书? (2)有一个6层书架共放了762本书，上层比下层少8本，最下层放几本书?
学而思秘籍六级练习册，三年级下奥数196/311
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