连加连减,口算号列车,4+1= 5+2= 5-2=,5+3= 7+1= 3-1=,8-2=,6-2=,5,4,6,2,3,8,7,8,4+2,+1=,6,7,3,3+,+,=,2,8,8,8,3,1=,5,4,10,4,2,4,4,3,3,10,=,2,口算号,8-2=6 6-2=4,5-2=3 3-1=2,5+2=7 7+1=8,4+1=5 5+3=8,5,5,4+1+3=8,5-2-1=2,5+2+1=8,8-2-2=4,4+3+1=8,7,10-3-5=2,7,2+3=5,1.,2+3=5,5+4=9,2+3+4=9,1.,2.,3+4+2=9,7,3.,8-4-2=2,4,4.,10-3-1=6,7,比一比,看谁算得又对又快,3+4+1=,8-5-3=,7+2+1=,2+2+4=,6+4+0=,4+3+2=,5+0+3=,5-2-1=,9-5-4=,10-2-7=,10-6-2=,8-0-6=,8,0,10,2,8,0,10,1,9,2,8,2,10,0,8,2,1,9,10,6,9,3,
