1.直接写出得数。
$\frac{12}{14} - \frac{3}{14} =$
$\frac{2}{7} + \frac{3}{7} =$
$\frac{7}{9} + \frac{2}{9} =$
$\frac{3}{11} + \frac{4}{11} + \frac{2}{11} =$
$\frac{26}{47} - \frac{17}{47} =$
$\frac{53}{100} + \frac{26}{100} =$
$1 - \frac{9}{20} =$
$1 - \frac{8}{17} - \frac{6}{17} =$
$\frac{12}{14} - \frac{3}{14} =$
$\frac{2}{7} + \frac{3}{7} =$
$\frac{7}{9} + \frac{2}{9} =$
$\frac{3}{11} + \frac{4}{11} + \frac{2}{11} =$
$\frac{26}{47} - \frac{17}{47} =$
$\frac{53}{100} + \frac{26}{100} =$
$1 - \frac{9}{20} =$
$1 - \frac{8}{17} - \frac{6}{17} =$
答案
1.$\frac{9}{14}$ $\frac{5}{7}$ $1$ $\frac{9}{11}$ $\frac{9}{47}$ $\frac{79}{100}$ $\frac{11}{20}$ $\frac{3}{17}$
2.计算下面各题。
$\frac{5}{8}+\frac{1}{3}$
$\frac{7}{15}-\frac{1}{4}$
$\frac{9}{20}-\frac{4}{15}$
$\frac{5}{6}-\frac{2}{3}$
$\frac{1}{2}+\frac{1}{6}$
$\frac{9}{10}+\frac{11}{20}$
$\frac{4}{5}-\frac{1}{9}$
$\frac{13}{24}+\frac{3}{8}+\frac{1}{6}$
$\frac{1}{3}+\frac{1}{6}-\frac{1}{5}$
$\frac{5}{8}+\frac{1}{3}$
$\frac{7}{15}-\frac{1}{4}$
$\frac{9}{20}-\frac{4}{15}$
$\frac{5}{6}-\frac{2}{3}$
$\frac{1}{2}+\frac{1}{6}$
$\frac{9}{10}+\frac{11}{20}$
$\frac{4}{5}-\frac{1}{9}$
$\frac{13}{24}+\frac{3}{8}+\frac{1}{6}$
$\frac{1}{3}+\frac{1}{6}-\frac{1}{5}$
答案
2.$\frac{23}{24}$ $\frac{13}{60}$ $\frac{11}{60}$ $\frac{1}{6}$ $\frac{2}{3}$ $1\frac{9}{20}$ $\frac{31}{45}$ $1\frac{1}{12}$ $\frac{3}{10}$
3.计算下面各题,能简便计算的要用简便方法计算。
$\frac{2}{7}+\frac{2}{9}+\frac{5}{7}+\frac{7}{9}$
$\frac{2}{3}+\frac{5}{8}+\frac{1}{3}$
$\frac{3}{8}-\frac{1}{4}+\frac{1}{2}$
$\frac{2}{7}+\frac{2}{9}+\frac{5}{7}+\frac{7}{9}$
$\frac{2}{3}+\frac{5}{8}+\frac{1}{3}$
$\frac{3}{8}-\frac{1}{4}+\frac{1}{2}$
答案
3.$2$ $1\frac{5}{8}$ $\frac{5}{8}$
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