1. $\frac{2}{3} ÷ \frac{4}{5} × \frac{9}{10} = \frac{(\ \ \ \ \ )}{(\ \ \ \ \ )} × \frac{(\ \ \ \ \ )}{(\ \ \ \ \ )} × \frac{(\ \ \ \ \ )}{(\ \ \ \ \ )} =$
$\frac{5}{2} ÷ 3 ÷ \frac{5}{6} = \frac{(\ \ \ \ \ )}{(\ \ \ \ \ )} × \frac{(\ \ \ \ \ )}{(\ \ \ \ \ )} × \frac{(\ \ \ \ \ )}{(\ \ \ \ \ )} =$
$\frac{4}{7} × \frac{21}{10} ÷ \frac{3}{5} = \frac{(\ \ \ \ \ )}{(\ \ \ \ \ )} × \frac{(\ \ \ \ \ )}{(\ \ \ \ \ )} × \frac{(\ \ \ \ \ )}{(\ \ \ \ \ )} =$
$\frac{5}{2} ÷ 3 ÷ \frac{5}{6} = \frac{(\ \ \ \ \ )}{(\ \ \ \ \ )} × \frac{(\ \ \ \ \ )}{(\ \ \ \ \ )} × \frac{(\ \ \ \ \ )}{(\ \ \ \ \ )} =$
$\frac{4}{7} × \frac{21}{10} ÷ \frac{3}{5} = \frac{(\ \ \ \ \ )}{(\ \ \ \ \ )} × \frac{(\ \ \ \ \ )}{(\ \ \ \ \ )} × \frac{(\ \ \ \ \ )}{(\ \ \ \ \ )} =$
答案:
1. $\frac{2}{3}÷\frac{4}{5}×\frac{9}{10}=\frac{2}{3}×\frac{5}{4}×\frac{9}{10}=\frac{3}{4}$ $\frac{5}{2}÷3÷\frac{5}{6}=\frac{5}{2}×\frac{1}{3}×\frac{6}{5}=1$ $\frac{4}{7}×\frac{21}{10}÷\frac{3}{5}=\frac{4}{7}×\frac{21}{10}×\frac{5}{3}=2$
2. $\frac{3}{4} ÷ 15 ÷ \frac{6}{5}$ $\frac{2}{5} ÷ \frac{1}{5} × \frac{1}{6}$ $\frac{6}{5} × \frac{2}{3} ÷ \frac{8}{15}$
答案:
2. $\frac{1}{24}$ $\frac{1}{3}$ $\frac{3}{2}$
3. 一个三角形的底是$\frac{3}{2}$米,高是$\frac{4}{9}$米。它的面积是多少平方米?
答案:
3. $\frac{1}{3}$平方米
4. 一辆汽车$\frac{4}{3}$小时行驶 120 千米。照这样计算,这辆汽车$\frac{8}{5}$小时行驶多少千米?
答案:
4. $120÷\frac{4}{3}×\frac{8}{5}=144$(千米)
5. 一堆货物有$\frac{5}{2}$吨,2 台拖拉机$\frac{5}{4}$小时可以运完。平均每台拖拉机每小时运多少吨?
答案:
5. $\frac{5}{2}÷2÷\frac{5}{4}=1$(吨)
6. 今年爸爸的年龄是爷爷的$\frac{8}{15}$,是小明的$\frac{10}{3}$。今年爷爷 75 岁,小明几岁?
答案:
6. $75×\frac{8}{15}÷\frac{10}{3}=12$(岁)
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