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