15×30= 4.9+5.31= 5.7÷100= 3.4+5.8+6.6=
320÷40= 3.68-2.52= 7.81×10= 300÷5÷2=
①9.32-2.5+5.32
②60.8-7.39-12.61
③24×15+500÷25
④67×26-26×62
月份
1
2
3
4
册数
783
906
949
735
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)÷ ]