1 口算
建议用时3分钟 评价:☆☆☆
$\frac{2}{7} + \frac{5}{7} =$
$\frac{3}{4} + \frac{1}{3} =$
$\frac{3}{4} - \frac{7}{12} =$
$\frac{4}{7} + \frac{1}{5} + \frac{4}{5} =$
$1 - \frac{7}{9} =$
$\frac{8}{9} - \frac{5}{6} =$
$1.4 - \frac{1}{3} =$
$2 - \frac{1}{4} - \frac{3}{4} =$
$0.4^3 =$
$\frac{2}{5} + \frac{3}{8} =$
$\frac{4}{5} - \frac{7}{15} =$
$\frac{1}{5} + \frac{1}{10} + \frac{1}{10} =$
$\frac{1}{2} + \frac{3}{8} =$
$\frac{2}{3} + \frac{7}{9} =$
$\frac{7}{8} - \frac{3}{4} =$
$1 - \frac{5}{9} + \frac{4}{9} =$
建议用时3分钟 评价:☆☆☆
$\frac{2}{7} + \frac{5}{7} =$
$\frac{3}{4} + \frac{1}{3} =$
$\frac{3}{4} - \frac{7}{12} =$
$\frac{4}{7} + \frac{1}{5} + \frac{4}{5} =$
$1 - \frac{7}{9} =$
$\frac{8}{9} - \frac{5}{6} =$
$1.4 - \frac{1}{3} =$
$2 - \frac{1}{4} - \frac{3}{4} =$
$0.4^3 =$
$\frac{2}{5} + \frac{3}{8} =$
$\frac{4}{5} - \frac{7}{15} =$
$\frac{1}{5} + \frac{1}{10} + \frac{1}{10} =$
$\frac{1}{2} + \frac{3}{8} =$
$\frac{2}{3} + \frac{7}{9} =$
$\frac{7}{8} - \frac{3}{4} =$
$1 - \frac{5}{9} + \frac{4}{9} =$
答案
1. 1
1. $\frac{13}{12}$
1. $\frac{1}{6}$
1. $1\frac{4}{7}$
1. $\frac{2}{9}$
1. $\frac{1}{18}$
1. $\frac{16}{15}$
1. 1
1. 0.064
1. $\frac{31}{40}$
1. $\frac{1}{3}$
1. $\frac{2}{5}$
1. $\frac{7}{8}$
1. $\frac{13}{9}$
1. $\frac{1}{8}$
1. $\frac{8}{9}$
1. $\frac{13}{12}$
1. $\frac{1}{6}$
1. $1\frac{4}{7}$
1. $\frac{2}{9}$
1. $\frac{1}{18}$
1. $\frac{16}{15}$
1. 1
1. 0.064
1. $\frac{31}{40}$
1. $\frac{1}{3}$
1. $\frac{2}{5}$
1. $\frac{7}{8}$
1. $\frac{13}{9}$
1. $\frac{1}{8}$
1. $\frac{8}{9}$
2 脱式计算(能简算的要简算)
建议用时6分钟 评价:☆☆☆
$1 - \frac{8}{15} - \frac{1}{15}$
$\frac{18}{11} + (\frac{16}{17} - \frac{7}{11})$
$\frac{9}{10} - (\frac{2}{5} + \frac{1}{4})$
$\frac{4}{3} - \frac{1}{8} + \frac{7}{12}$
$\frac{9}{7} + \frac{1}{8} + \frac{5}{7} + \frac{3}{8}$
$\frac{7}{8} - \frac{4}{5} + \frac{9}{8} - \frac{1}{5}$
$\frac{7}{8} + \frac{6}{25} + \frac{1}{8}$
$3.2 - \frac{7}{12} - 0.2 - \frac{5}{12}$
$\frac{11}{12} - (\frac{10}{11} - \frac{1}{2} + \frac{1}{11})$
建议用时6分钟 评价:☆☆☆
$1 - \frac{8}{15} - \frac{1}{15}$
$\frac{18}{11} + (\frac{16}{17} - \frac{7}{11})$
$\frac{9}{10} - (\frac{2}{5} + \frac{1}{4})$
$\frac{4}{3} - \frac{1}{8} + \frac{7}{12}$
$\frac{9}{7} + \frac{1}{8} + \frac{5}{7} + \frac{3}{8}$
$\frac{7}{8} - \frac{4}{5} + \frac{9}{8} - \frac{1}{5}$
$\frac{7}{8} + \frac{6}{25} + \frac{1}{8}$
$3.2 - \frac{7}{12} - 0.2 - \frac{5}{12}$
$\frac{11}{12} - (\frac{10}{11} - \frac{1}{2} + \frac{1}{11})$
答案
2. $\frac{2}{5}$
2. $1\frac{16}{17}$
2. $\frac{1}{4}$
2. $\frac{43}{24}$
2. $2\frac{1}{2}$
2. 1
2. $1\frac{6}{25}$
2. 2
2. $\frac{5}{12}$
2. $1\frac{16}{17}$
2. $\frac{1}{4}$
2. $\frac{43}{24}$
2. $2\frac{1}{2}$
2. 1
2. $1\frac{6}{25}$
2. 2
2. $\frac{5}{12}$
成成家在学校的北偏东$30°$方向上,距离是500米,那么学校就在成成家(
西
)偏(南
)(60°(或南 西 30°)
)方向上,距离是(500
)米。答案
3. 西 南 60°(或南 西 30°) 500
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