第25页 - 亮点给力提优课时作业本五年级数学江苏版

$=\frac {22}{15}-\frac {3}{10}$

$=\frac {7}{6}$

$=\frac {46}{35}-\frac {32}{35}$

$=\frac {2}{5}$

$=\frac {11}{12}-\frac {1}{12}$

$=\frac {5}{6}$

$=\frac {7}{8}+\frac {1}{2}$

$=\frac {11}{8}$

$=\frac {27}{20}-\frac {1}{2}$

$=\frac {17}{20}$

$=\frac {4}{3}+\frac {2}{9}$

$=\frac {14}{9}$

$=\frac {3}{4}-\frac {7}{10}$

$=\frac {1}{20}$

$=\frac {3}{7}-\frac {1}{7}$

$=\frac {2}{7}$

$=\frac {5}{6}+\frac {1}{6}-\frac {5}{9}$

$=1-\frac {5}{9}$

$= \frac {4}{9}$

$=(\frac {5}{9}+\frac {4}{9})+(\frac {4}{11}+\frac {6}{11})$

$=1+\frac {10}{11}$

$=1 \frac {10}{11}$

$=(\frac {17}{15}+\frac {13}{15})-(\frac {2}{3}+\frac {1}{3})$

$=2-1$

$=1$

$=3-(\frac {11}{9}+\frac {7}{9})$

$=3-2$

$=1$

$=(\frac {19}{14}-\frac {5}{14})-(\frac {1}{4}-\frac {1}{4})$

$=1-0$

$=1$

$=\frac {7}{8}+\frac {1}{8}+\frac {7}{12}$

$=1+\frac {7}{12}$

$=1 \frac {7}{12}$

$=(\frac {13}{11}-\frac {1}{11})-(\frac {3}{5}+\frac {2}{5})$

$=\frac {12}{11}-1$

$=\frac {1}{11}$

$=\frac {7}{8}-\frac {3}{8}-\frac {2}{5}$

$=\frac {1}{2}-\frac {2}{5}$

$=\frac {1}{10}$

$=(\frac {5}{9}-\frac {4}{9})+(\frac {3}{10}+\frac {7}{10})$

$=\frac {1}{9}+1$

$=\frac {10}{9}$

$=(\frac {14}{9}-\frac {2}{9})-(\frac {7}{11}+\frac {4}{11})$

$=\frac {4}{3}-1$

$=\frac {1}{3}$

=100000+10000+1000+100+10-2×5

=111110-10

=111100

=(67+75)×9÷2

=142×9÷2

=639

$=1-\frac 12+\frac 12-\frac 13+\frac 13-\frac 14+\frac 14-\frac 15+…+\frac 19-\frac {1}{10}$

$=1-\frac {1}{10}$

$=\frac {9}{10}$

9

$=1-\frac 12+1-\frac 14+1-\frac 18+\frac 1-\frac {1}{16}+1-\frac {1}{32}+1-\frac {1}{64}$

$=6-(\frac 12+\frac 14+\frac 18+\frac {1}{16}+\frac {1}{32}+\frac {1}{64})$

$=6-(1-\frac {1}{64})$

$=5 \frac {1}{64}$