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