a) https://www.atm.org.uk/write/mediauploads/resources/richard_skemp.pdf[br]b) https://www.nctm.org/Publications/mathematics-teaching-in-middle-school/2006/Vol12/Issue2/Relational-Understanding-and-Instrumental-Understanding/
a) 分數乘法 分析課[br] https://www.ggbm.at/jn59k4cy[br]b) 分數除法[br] Anthony OR https://www.ggbm.at/cKGuqU8M[br] Steve Phelps https://www.ggbm.at/tu47hfhq