Matching Pairs Identities and FactorizationOnline version Matching Terms Activity for Consolidation by Gavin Ip 1 Equation 2 Grouping 3 Identity 4 Factorization 5 Taking Out Common Factors 6 Prove 7 Expansion 8 Check whether 抽取共同因子 因式分解 展開 証明 併項 恆等式 驗証 公式