15.直接写出得数.
$\frac{2}{7}$+$\frac{4}{7}$= | $\frac{1}{2}$+$\frac{1}{2}$= | 60×8= | 19+2.7= | 32÷2= |
80×90= | 25×4×7= | 103×4= | 45×40= | $\frac{5}{9}$-$\frac{2}{9}$= |
11.下列运动不属于旋转的是( )
A. | 升降国旗 | B. | 车轮转动 | C. | 风车转动 |
10.面积是36平方米的长方形,长是9米,宽是( )
0 157799 157807 157813 157817 157823 157825 157829 157835 157837 157843 157849 157853 157855 157859 157865 157867 157873 157877 157879 157883 157885 157889 157891 157893 157894 157895 157897 157898 157899 157901 157903 157907 157909 157913 157915 157919 157925 157927 157933 157937 157939 157943 157949 157955 157957 157963 157967 157969 157975 157979 157985 157993 199269
A. | 9米 | B. | 4米 | C. | 40米2 |