8．脱式计算
| $15\frac{3}{8}-5\frac{3}{4}+4.8$ | $9.28-3\frac{3}{13}-2\frac{2}{13}-1\frac{8}{13}$ | $6\frac{1}{8}-1\frac{5}{6}-3\frac{15}{16}$ |
| $12×（\frac{3}{4}-\frac{1}{2}+\frac{5}{6}）$ | $17×[\frac{3}{8}+（\frac{5}{4}-\frac{5}{6}）]$ | $4\frac{8}{25}-\frac{7}{15}×\frac{3}{5}÷\frac{7}{45}$． |
6．直接写出得数
0 157607 157615 157621 157625 157631 157633 157637 157643 157645 157651 157657 157661 157663 157667 157673 157675 157681 157685 157687 157691 157693 157697 157699 157701 157702 157703 157705 157706 157707 157709 157711 157715 157717 157721 157723 157727 157733 157735 157741 157745 157747 157751 157757 157763 157765 157771 157775 157777 157783 157787 157793 157801 199269
| $4-\frac{7}{15}$= | $\frac{3}{5}÷\frac{7}{45}$= | $\frac{2}{9}×12$= | $（\frac{1}{4}-\frac{1}{5}）÷\frac{1}{20}$= |
| $\frac{1}{4}+\frac{1}{5}$= | $\frac{2}{3}÷\frac{3}{2}$= | $\frac{5}{51}×17$= | $\frac{3}{4}×\frac{5}{6}÷\frac{5}{6}×\frac{3}{4}$= |
| $\frac{8}{9}+\frac{4}{11}+\frac{1}{9}$= | $1-\frac{1}{6}-\frac{1}{6}$= | $\frac{1}{8}+\frac{2}{15}+\frac{7}{8}$= | $\frac{5}{6}+\frac{3}{4}-\frac{1}{3}$= |