18.计算下面各题.
2.7×$\frac{3}{5}$; | 5.6×$\frac{5}{6}$; | 1.4×$\frac{5}{6}$; |
4.8×$\frac{2}{3}$; | 7.5×$\frac{1}{5}$; | 6.9×$\frac{5}{8}$. |
15.A×0.56的积( )A(A>0)
A. | 小于 | B. | 等于 | C. | 大于 |
13.在横线里填上“>”“<”或“=”
0 161817 161825 161831 161835 161841 161843 161847 161853 161855 161861 161867 161871 161873 161877 161883 161885 161891 161895 161897 161901 161903 161907 161909 161911 161912 161913 161915 161916 161917 161919 161921 161925 161927 161931 161933 161937 161943 161945 161951 161955 161957 161961 161967 161973 161975 161981 161985 161987 161993 161997 162003 162011 199269
$\frac{1}{6}$×10>$\frac{1}{6}$; | $\frac{3}{4}$×1=$\frac{3}{4}$; | $\frac{1}{5}$×$\frac{5}{9}$<$\frac{5}{9}$×5; |
$\frac{7}{13}$×0<$\frac{7}{13}$; | $\frac{7}{12}$×$\frac{1}{2}$<$\frac{7}{12}$; | $\frac{4}{7}$×16>$\frac{4}{7}$×$\frac{7}{8}$. |