①600-289=
②*389+172=
③*739+286=
④350+220=
⑤*405-223=
⑥*810-467=
8.1元+2.3元=
5.6元-3.4元=
8.3元+7.5元=
24.8元+7.9元=
1.05元+12.67元=
7.45元-3.76 元=
15×6=
330×3=
160×5=
400×4=
360+6=
640÷8=
68÷4=
803-597≈
①78×6=
②420×8=
③208×7=
④316×5=
⑤195×6=
⑥324×6=
①355+245=
②204+628+157=
③900-467=
④835-428-97=
×3=33 ÷2=60 ÷4=80
÷3=33 ×2=60 ×4=80
①250-250÷25×2
②18÷ ×
③5.2÷0.4÷2.5
④(34- )÷17
⑤4.3×1.75-1.75+ ×6.7
⑥ ×[(72.8-69.6)÷ ]