进位加法 ( 一 )口算。80+2 =80+20 =8210030+4 =30+40 =347034+4 =34+30 =386441 +50 =41 + 5 =9146一、相信同学们...
进位加法(一)一、复习旧知一、复习旧知20 + 13 =30 + 14 =24 + 5 =3344294 + 9 =3 + 7 =6 + 8 = 131014...