30 4 = 34 30 =344加数加数加数加数和和被减数被减数减数减数差差4 30 = 3434 4 = 301. .46404640640640 =646646 = = =2. .603+=360+=6360=633=6363360509+=950+=5950=599=5950599708+=870+=7870=788=78788703. .725043768470 2 =74 70 =60 8 =56 6 =7 30 =84 80 =4. .加加 数数加加 数数和和被减数被减数减减 数数差差3097408505250464989039475826085. .写出相邻的两个数。写出相邻的两个数。6769808298100，68，81，99，6. .20个个一共有多少个篮球？一共有多少个篮球？（个）（个）204247. .一共要搬一共要搬38把椅子。把椅子。已经搬了已经搬了30把。把。还要搬多少把？还要搬多少把？（把）（把）38 308
