摘要：18. 开学初.小芳和小亮去学校商店购买学习用品.小芳用18元钱买了1支钢笔和3本笔记本,小亮用31元买了同样的钢笔2支和笔记本5本. (1)求每支钢笔和每本笔记本的价格, (2)校运会后.班主任拿出200元学校奖励基金交给班长.购买上述价格的钢笔和笔记本共48件作为奖品.奖给校运会中表现突出的同学.要求笔记本数不少于钢笔数.共有多少种购买方案?请你一一写出. 解:(1)设每支钢笔x元.每本笔记本y元····································································· 1分 依题意得:········································································· 3分 解得:·························································································· 4分 答:每支钢笔3元.每本笔记本5元························································ 5分 (2)设买a支钢笔.则买笔记本(48-a)本 依题意得: ·························································· 7分 解得: ··············································································· 8分 所以.一共有5种方案．·········································································· 9分 即购买钢笔.笔记本的数量分别为: 20.28, 21.27, 22.26, 23.25, 24.24． 10分

网址：http://m.1010jiajiao.com/timu_id_4032315[举报]