8、9的組成及加減法,1,2,8,7,1,8,1,7,加法,減法,3,8,6,2,8,2,6,加法,減法,4,8,5,3,8,5,3,加法,減法,5,8,4,4,加法,減法,6,1,7,2,6,3,5,4,4,5,3,6,2,7,1,7,3,5,4,4,2,6,1,7,8,8,填一填,8,=,=,=,=,6,2,8,2,6,8,8,5,8,3,3,5,9,10,9,8,1,9,1,8,加法,減法,11,9,7,2,9,2,7,加法,減法,12,9,6,3,9,3,6,加法,減法,13,9,5,4,9,4,5,加法,減法,14,1,8,2,7,3,6,4,5,5,4,6,3,7,2,8,1,15,9,6,4,7,8,3,5,2,填上合適的數(shù),16,你會嗎？,17,7,+,1,=,8,1,+,7,=,8,或,18,8,7,=,1,8,1,=,7,或,19,6,+,2,=,8,2,+,6,=,8,或,20,8,6,=,2,8,2,=,6,或,21,5,+,3,=,8,3,+,5,=,8,或,22,8,5,=,3,8,3,=,5,或,23,4,+,4,=,8,24,8,4,=,4,25,8,+,1,=,9,1,+,8,=,9,或,26,9,8,=,1,9,1,=,8,或,27,7,+,2,=,9,2,+,7,=,或,9,28,9,7,=,2,9,2,=,或,7,29,6,+,3,=,9,3,+,6,=,或,9,30,9,6,=,3,9,3,=,或,6,31,5,+,4,=,9,4,+,5,=,或,9,32,9,5,=,4,9,4,=,或,5,33,34,