求 Progressive Mathematics3 答案

商務印書館有售：



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購買：
http://www.cp1897.com.hk/product_info.php?BookId=9789882008953

樣頁：
http://www.hkep.com/_dqtest/proof/Special/9789882008953s.pdf

目錄：
http://www.hkep.com/_dqtest/proof/Special/9789882008953c.pdf

有齊Progressive Mathematics1，Progressive Mathematics2，Progressive Mathematics3
http://www.hkep.com/_dqtest/proof/pu_detail113.php