合并同类项
Collecting Like Terms
通过合并同类项来化简代数式——将具有相同变量和指数的项合并（例如，3a + 2b + 5a = 8a + 2b），同时保持等价关系不变。
Simplify algebraic expressions by collecting like terms — combine terms with the same variable and power (e.g., 3a + 2b + 5a = 8a + 2b) while maintaining equivalence
学习证据 / Evidence
- 识别代数表达式中的同类项
- 合并包含正系数和负系数的同类项
- 化简涉及多个变量和常数项的表达式
- Identify like terms in an algebraic expression
- Combine like terms involving positive and negative coefficients
- Simplify expressions involving multiple variables and constant terms
评估问题 / Assessment
如果{{name}}看到一个像“5a + 3b + 2a”这样的表达式，能否通过合并同类项将其化简为“7a + 3b”？
If {{name}} sees an expression like "5a + 3b + 2a," can they simplify it by collecting the like terms to get "7a + 3b"?