西师大版小学数学一年级上学期第五单元第2课时《8加几》

+ 5 = 13      6 += 14       +8 = 16

8 +=17      + 8 =15         4 +=12

10 – 8 + 9 =       16 + 3 – 5 =       19 – 4 – 3 =

18 – 6 – 2 =      19 – 9 – 7 =       2 + 7 + 8 =