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