8．计算下面各题．
| $\frac{25}{39}$×26 | $\frac{13}{42}$×3 | $\frac{7}{25}$×$\frac{10}{21}$ |
| $\frac{2}{15}$×$\frac{6}{25}$ | $\frac{5}{8}$×$\frac{5}{8}$ | $\frac{2}{3}$×$\frac{3}{4}$×2 |
| $\frac{5}{21}$×14×$\frac{2}{10}$ | $\frac{9}{14}$×$\frac{2}{3}$×$\frac{7}{15}$ | $\frac{5}{3}$×$\frac{3}{7}$×$\frac{3}{5}$ |
5．把130块糖分装成数量相等的小包，每包糖的块数多于4块，但不超过20块，有（ ）种分法．
0 158857 158865 158871 158875 158881 158883 158887 158893 158895 158901 158907 158911 158913 158917 158923 158925 158931 158935 158937 158941 158943 158947 158949 158951 158952 158953 158955 158956 158957 158959 158961 158965 158967 158971 158973 158977 158983 158985 158991 158995 158997 159001 159007 159013 159015 159021 159025 159027 159033 159037 159043 159051 199269
| A． | 2 | B． | 3 | C． | 4 | D． | 13 |