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一、分类讨论思想在代数中的应用分类讨论思想在代数中的应用较多,如:数式、方程(组)、不等式(组)等.例1 中百超市推出如下优惠方案:(1)一次性购物不超过100元,不享受优惠;(2)一次性购物超过100元。但不超过300元一律9折;(3)一次性购物超过300元一律8折.某人两次购物分别付款80元、252元,如果他将这两次所购商品一次性购买,则
First, the classification of the discussion of ideas in the application of algebra to discuss ideas in algebra in more applications, such as: number, equation (group), inequality (group), etc. Example 1 Baibai supermarket launched the following preferential programs: (1) once Sex shopping does not exceed 100 yuan and no discount is available; (2) One-time shopping exceeds 100 yuan. But not more than 300 yuan 10% off; (3) a one-time shopping more than 300 yuan will be 20% off. Someone to pay 80 yuan, 252 yuan for two shopping, if he will buy these two purchases of goods at one time, then