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清华一条龙1BLesson6numbers123＋＝Oneplustwoisthree.134＋＝Oneplusthreeisfour.Howmuchisoneminusone?Oneplusoneiszero.Oneplusfourisfive.Howmuchiso

neplusfour?1+4=?Oneplusfiveissix.Howmuchisoneplusfive?1+5=？Oneplusseveniseight.Howmuchisoneplusseven?1+

7=?Onepluseightisnine.Howmuchisonepluseight?1+8=?Twoplustwoisfour.Howmuchistwoplustwo?2+2=?716－＝615－＝Sevenminusoneissix.Sixminusoneisfive.Howmuc

hissevenminusone?Howmuchissixminusone?312－＝211－＝Threeminusoneistwo.Twominusoneisone.Howmuchisthreeminusone?Howmuchistwominu

sone?