线性数列

生成并描述线性数列，包括含有负数或小数步长的数列；识别数列的逐项规则。

Generate and describe linear number sequences, including those with negative and decimal steps; identify the term-to-term rule

学习证据 / Evidence

• 继续写出数列 2.5, 4.0, 5.5, ...，并说明规则是“每次加 1.5”。
• 生成一个跨过 0 的数列（如 3, 1, −1, −3, ...）。
• 描述给定线性数列的逐项规则，并预测第 10 项。

• Continue the sequence 2.5, 4.0, 5.5, ... and state the rule as 'add 1.5'
• Generate terms of a sequence that crosses zero (e.g. 3, 1, −1, −3, ...)
• Describe the term-to-term rule for a given linear sequence and predict the 10th term

评估问题 / Assessment

如果{{name}}看到一个数列，如 3, 7, 11, 15……，{{name}}能否描述其中的规律、继续写下去，并推算出第 10 个数是多少？

If {{name}} sees a number sequence like 3, 7, 11, 15… can they describe the rule, continue it, and predict what the 10th number will be?