1. 直接写出得数。
实际用时:分钟
$\frac{4}{5}+\frac{3}{4}=$ $\frac{11}{12}-\frac{3}{4}=$ $36×\frac{7}{12}=$ $\frac{25}{7}÷5=$
$\frac{7}{10}+\frac{4}{15}=$ $\frac{7}{5}-\frac{2}{3}=$ $\frac{1}{5}×30=$ $24÷\frac{8}{11}=$
$\frac{7}{20}+\frac{2}{15}=$ $\frac{16}{15}-\frac{4}{5}=$ $\frac{9}{10}×\frac{5}{8}=$ $\frac{4}{21}÷\frac{4}{21}=$
$\frac{3}{7}+\frac{1}{14}=$ $\frac{9}{14}-\frac{2}{7}=$ $\frac{7}{6}×\frac{12}{7}=$ $\frac{15}{14}÷1.5=$
$\frac{7}{30}+\frac{4}{15}=$ $\frac{7}{9}-\frac{2}{27}=$ $\frac{9}{14}×\frac{7}{3}=$ $3.2÷\frac{4}{5}=$
$\frac{7}{16}+\frac{3}{8}=$ $2-\frac{2}{15}=$ $\frac{7}{8}×5.6=$ $\frac{4}{15}÷\frac{4}{5}=$
实际用时:分钟
$\frac{4}{5}+\frac{3}{4}=$ $\frac{11}{12}-\frac{3}{4}=$ $36×\frac{7}{12}=$ $\frac{25}{7}÷5=$
$\frac{7}{10}+\frac{4}{15}=$ $\frac{7}{5}-\frac{2}{3}=$ $\frac{1}{5}×30=$ $24÷\frac{8}{11}=$
$\frac{7}{20}+\frac{2}{15}=$ $\frac{16}{15}-\frac{4}{5}=$ $\frac{9}{10}×\frac{5}{8}=$ $\frac{4}{21}÷\frac{4}{21}=$
$\frac{3}{7}+\frac{1}{14}=$ $\frac{9}{14}-\frac{2}{7}=$ $\frac{7}{6}×\frac{12}{7}=$ $\frac{15}{14}÷1.5=$
$\frac{7}{30}+\frac{4}{15}=$ $\frac{7}{9}-\frac{2}{27}=$ $\frac{9}{14}×\frac{7}{3}=$ $3.2÷\frac{4}{5}=$
$\frac{7}{16}+\frac{3}{8}=$ $2-\frac{2}{15}=$ $\frac{7}{8}×5.6=$ $\frac{4}{15}÷\frac{4}{5}=$
答案
1. $\frac{31}{20}$ $\frac{1}{6}$ $21$ $\frac{5}{7}$
$\frac{29}{30}$ $\frac{11}{15}$ $6$ $33$
$\frac{29}{60}$ $\frac{4}{15}$ $\frac{9}{16}$ $1$
$\frac{1}{2}$ $\frac{5}{14}$ $2$ $\frac{5}{7}$
$\frac{1}{2}$ $\frac{19}{27}$ $\frac{3}{2}$ $4$
$\frac{13}{16}$ $\frac{28}{15}$ $\frac{49}{10}$ $\frac{1}{3}$
$\frac{29}{30}$ $\frac{11}{15}$ $6$ $33$
$\frac{29}{60}$ $\frac{4}{15}$ $\frac{9}{16}$ $1$
$\frac{1}{2}$ $\frac{5}{14}$ $2$ $\frac{5}{7}$
$\frac{1}{2}$ $\frac{19}{27}$ $\frac{3}{2}$ $4$
$\frac{13}{16}$ $\frac{28}{15}$ $\frac{49}{10}$ $\frac{1}{3}$
2. 计算下面各题。
$\frac{9}{11} ÷ \frac{3}{8} × \frac{11}{24}$
$( \frac{2}{3} - \frac{3}{8} + \frac{1}{6} ) × 48$
$\frac{3}{11} × 8 × \frac{11}{6} × 125$
$\frac{9}{11} ÷ \frac{3}{8} × \frac{11}{24}$
$( \frac{2}{3} - \frac{3}{8} + \frac{1}{6} ) × 48$
$\frac{3}{11} × 8 × \frac{11}{6} × 125$
答案
2. $1$ $22$ $500$
3. 计算图中涂色部分的面积。(单位:cm)

答案
3. $56.52\ \mathrm{cm}^2$ $56.52\ \mathrm{cm}^2$
美美在计算一个数加$\frac{3}{5}$时,糊涂地当成了乘法计算,得出的结果是$\frac{9}{8}$。那么正确的结果是(
$\frac{99}{40}$
)。答案
【思维提升】$\frac{99}{40}$
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