21÷3=
7×60=
200×14=
440÷22=
3600÷900=
25×40=
125×8=
350÷70=
106×8=
4000÷80=
①37×64=
②0.9+5.4=
③469÷8=
④11.2-5.7=
⑤860÷4=
⑥83×45=
5×25=
660÷30=
400÷5=
2400÷60=
1000÷8=
107×3=
40×50=
560÷7=
1000-340=
720+80=
①89000000=
②500000000=
③320000=
,