9.用自己喜欢的方法计算.
| 5.6×0.7+0.2×5.6+0.56 | 0.9+99×0.9 | 89×[34-(716-14 )] |
| 720-800÷16 | [12-(34-35 )]÷710 | 8.5÷[(1+0.5)×5] |
7.直接写出得数.
| 180+90= | 25×0.7×4= | 2-2÷3= | ($\frac{3}{8}$-0.375)×5= | 32÷53×0= |
| 0.77+0.33= | (0.18+0.9)÷9= | 2×$\frac{1}{4}$÷2×$\frac{1}{4}$= | 5.2-4= | 13÷2÷13= |
| 7÷1.4= | 1.68+1.5= | ($\frac{1}{4}$+$\frac{3}{4}$)×8= |
6.能与 9:3组成比例的是( )
| A. | 15:2 | B. | 2:15 | C. | 6:2 |
5.把一根3米长的绳子平均分成4段,每段长是( )
0 139929 139937 139943 139947 139953 139955 139959 139965 139967 139973 139979 139983 139985 139989 139995 139997 140003 140007 140009 140013 140015 140019 140021 140023 140024 140025 140027 140028 140029 140031 140033 140037 140039 140043 140045 140049 140055 140057 140063 140067 140069 140073 140079 140085 140087 140093 140097 140099 140105 140109 140115 140123 199269
| A. | $\frac{1}{4}$ | B. | $\frac{3}{4}$米 | C. | $\frac{1}{4}$米 |