数学开放型题形式多种多样,若其未知要素是题设,则称为条件开放题;若其未知要素是推理,则称策略开放题;若其未知要素为结论,则为结论开放题。有的开放性问题,只给出一定的情境,其条件、策略都需要学习主体在问题解决过程中自行设定、寻找与构建,则称为综合开放题。 1.条件开放题 设计策略:将封闭问题的条件加以更换,弱化或去掉,可得到条件开放题。 例1 计算①(+5)+ Mathematical open-ended questions have various forms. If the unknown elements are questions, they are called conditional open questions. If the unknown elements are reasoning, they are called strategy opening questions. If the unknown elements are conclusions, they are open conclusion questions. Some open issues only give certain situations. Their conditions and strategies all require learning subjects to set, find and construct themselves in the course of problem solving. 1. Conditional open question Design strategy: Replace the condition of the closed problem, weaken it or remove it, and get the conditional open question. Example 1 Calculation 1(+5)+