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

hisoneplusfour?1+4=?Oneplusfiveissix.Howmuchisoneplusfive?1+5=？Oneplusseveniseight.Howmuchisoneplusseven?1+7=

?Onepluseightisnine.Howmuchisonepluseight?1+8=?Twoplustwoisfour.Howmuchistwoplustwo?2+2=?716－＝615－＝Sevenminusone

issix.Sixminusoneisfive.Howmuchissevenminusone?Howmuchissixminusone?312－＝211－＝Threeminusoneistwo.Two

minusoneisone.Howmuchisthreeminusone?Howmuchistwominusone?