1、口算竞赛练习1549=94=5918=287=497=366=7224=213=427=97=4129=364=357=568=449=182=19+41=286=7216=637=78=75=4332=96=734=364=358=99=728=305=567=4610=648=639=82=6540=240=648=756=819=510+200=3816=567=5520=7+18=455=126=946=130+80=71=42=93=468=2523=217=99=857=1235=73=5832=938=2771=88=8028=306=4633=324=3360=364=408=
2、809=546=244=2115=427=408=763=3622=356=6113=口算竞赛练习2306=568=449=182=364=286=7216=637=648=75=4332=96=51=364=358=99=153=305=567=4610=168=639=82=6540=426=648=756=819=40050=3816=567=5520=3826=455=126=946=938=71=42=93=497=2523=217=99=69=1235=73=5832=5630=2771=88=8028=355=4633=324=3360=2725=408=809=546=244=
3、2115=427=408=763=3622=356=6113=94=5918=287=155=366=7224=213=93=97=4129=364=4215=口算竞赛练习3244=2115=427=408=763=3622=356=6113=94=5918=287=155=366=7224=213=93=97=4129=64=4215=568=449=182=189=286=7216=637=18060=75=4332=96=7240=364=358=99=478=305=567=4610=1485=639=82=6540=6127=648=756=819=17020=3816=567=55
4、20=59=455=126=946=77=71=42=93=7316=2523=217=99=60300=1235=73=5832=105=2771=88=8028=8329=4633=324=3360=56=408=809=546=4317=口算竞赛练习482=4330=549=49=328=91=497=82=81=77=427=328=99=9642=357=81=84+7=5836=19+41=99=8044=57=130+80=84+7=1800900=729=468=8044=420+80=366=857=420+80=50060=819=938=50060=898=42+13=306=898=648=243=364=648=34+9=24+8=1800+200=34+9=147=273=9380=147=5+58=42+13=78=5+58=648=426=734=648=63=7+44=728=63=99=427=648=99=728=648=240=728=78+15=213=279=78+15=8320=48=53+8=8320=
