课件25张PPT。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=?? 546238784+2?? +1=? 6? 7? 33+?? +=288? 8? -3? -1=? 5410-4-2=44? 3? 3? 10? 9=2432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? 554+1+3=8 5-2-1=2 5+2+1=8 8-2-2=4 992434+3+1=8710-3-5=272+3=51.2+3=55+4=92+3+4=91.2.3+4+2=973.8-4-2=244.10-3-1=67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=80102801019282100821910693