1. 计算下面各题。
$\frac{5}{3} × 3 =$
$\frac{7}{8} × \frac{4}{7} =$
$\frac{7}{18} × \frac{9}{7} =$
$\frac{2}{3} × \frac{12}{7} =$
$3.6 × \frac{3}{4} =$
$\frac{13}{30} × \frac{15}{13} =$
$\frac{5}{3} × 3 =$
$\frac{7}{8} × \frac{4}{7} =$
$\frac{7}{18} × \frac{9}{7} =$
$\frac{2}{3} × \frac{12}{7} =$
$3.6 × \frac{3}{4} =$
$\frac{13}{30} × \frac{15}{13} =$
答案
1. 5
2. $\frac{1}{2}$
3. $\frac{1}{2}$
4. $\frac{8}{7}$
5. 2.7
6. $\frac{1}{2}$
2. $\frac{1}{2}$
3. $\frac{1}{2}$
4. $\frac{8}{7}$
5. 2.7
6. $\frac{1}{2}$
2. 用运算律进行简便计算。
$\frac{7}{15}×\frac{2}{9}×\frac{5}{14}$
$\frac{4}{5}×\frac{9}{7} - 0.8×\frac{2}{7}$
$25×\frac{5}{12} - \frac{5}{12}$
$1 - [ ( \frac{4}{5} - \frac{2}{3} ) × \frac{15}{16} ]$
$( \frac{3}{4} - \frac{2}{3} + \frac{7}{12} ) × 24$
$97×\frac{5}{96}$
$\frac{7}{15}×\frac{2}{9}×\frac{5}{14}$
$\frac{4}{5}×\frac{9}{7} - 0.8×\frac{2}{7}$
$25×\frac{5}{12} - \frac{5}{12}$
$1 - [ ( \frac{4}{5} - \frac{2}{3} ) × \frac{15}{16} ]$
$( \frac{3}{4} - \frac{2}{3} + \frac{7}{12} ) × 24$
$97×\frac{5}{96}$
答案
1. $\frac{1}{27}$
2. $\frac{4}{5}$
3. 10
4. $\frac{7}{8}$
5. 16
6. $5\frac{5}{96}$
2. $\frac{4}{5}$
3. 10
4. $\frac{7}{8}$
5. 16
6. $5\frac{5}{96}$
1. 超市第一天卖出苹果 216 kg,第二天对苹果进行促销活动,卖出的苹果比第一天多$\frac{3}{4}$,第二天卖出苹果多少千克?
答案
$216×(1+\dfrac{3}{4})=378$(kg)
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