13.直接写得数.
54+28= | 0.36÷0.1= | 2.1×4= | 0.5×0.4= | 7.2+8= |
$\frac{1}{3}$÷$\frac{1}{5}$= | $\frac{5}{6}$×$\frac{1}{2}$= | $\frac{1}{2}$-$\frac{1}{8}$= | 100÷0.1= | 0.625÷$\frac{5}{8}$= |
12.在长15厘米,宽6厘米的长方形纸片上,最多可剪( )半径是1厘米的圆.
A. | 20 | B. | 21 | C. | 28 |
11.用24个棱长1厘米的小正方体摆成不同的长方体,可以摆成( )种.
A. | 4 | B. | 12 | C. | 6 |
10.一个圆柱的高不变,底面半径扩大3倍,体积扩大( )
A. | 3 | B. | 6 | C. | 9 |
7.计算题
5$\frac{1}{12}$-x=3$\frac{7}{18}$ | 2$\frac{11}{12}$:5=0.75:x |
614115-517440÷168 | (3.3×6.3×0.6)÷(1.8+2.7×1.9) |
18-2$\frac{2}{15}$÷(3$\frac{19}{21}$+1$\frac{3}{7}$)×20$\frac{5}{18}$ | 2.74-0.56×(2$\frac{5}{12}$-1$\frac{19}{60}$+2.275) |
4.能简便的用简便计算.
0 158885 158893 158899 158903 158909 158911 158915 158921 158923 158929 158935 158939 158941 158945 158951 158953 158959 158963 158965 158969 158971 158975 158977 158979 158980 158981 158983 158984 158985 158987 158989 158993 158995 158999 159001 159005 159011 159013 159019 159023 159025 159029 159035 159041 159043 159049 159053 159055 159061 159065 159071 159079 199269
798+10570÷35 | 9.81×0.1+0.5×98.1+0.049×981 |
(1-$\frac{3}{4}$×$\frac{2}{5}$)÷($\frac{1}{4}$+$\frac{3}{8}$) | $\frac{1}{1×3}$+$\frac{1}{3×5}$+$\frac{1}{5×7}$…+$\frac{1}{17×19}$+$\frac{1}{19×21}$ |
2008×20092009-2009×20082008 | 2$\frac{7}{20}$÷[5$\frac{3}{4}$-4.5×(20%+$\frac{1}{3}$)] |