19.解比例(我做的最仔细)
| $\frac{5}{17}$÷9+$\frac{1}{9}$×$\frac{12}{17}$ | 2-$\frac{6}{13}$÷$\frac{9}{26}$-$\frac{2}{3}$ | 87×$\frac{3}{86}$ |
| [$\frac{1}{2}$-($\frac{3}{4}$-$\frac{3}{5}$)]÷$\frac{7}{10}$ | $\frac{7}{9}$÷$\frac{11}{5}$+$\frac{2}{9}$×$\frac{5}{11}$ | 7÷$\frac{3}{4}$×7÷$\frac{3}{4}$ |
18.直接写得数
| $\frac{3}{8}$+$\frac{1}{8}$= | 3.6÷1.2= | 24×$\frac{3}{4}$= | 5×15%= | $\frac{2}{5}$÷3= |
| 18×$\frac{2}{9}$= | 1-$\frac{2}{5}$+$\frac{3}{5}$= | $\frac{8}{13}$÷7×$\frac{5}{13}$ | 4×0.27×25 | 560÷16÷5 |
| $\frac{1}{4}$×4÷$\frac{1}{4}$×4 |
17.红星乡今年西瓜产量比去年增产18%,也就是增产( )
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| A. | 十八成 | B. | 一成八 | C. | 零点一成八 |