第110页 - 亮点给力提优课时作业本五年级数学江苏版

$=\frac {11}{15}-\frac {1}{6}-\frac {8}{15}$

$=\frac {3}{15}-\frac {1}{6}$

$=\frac {1}{30}$

$=\frac {16}{18}-\frac {3}{18}+\frac {12}{18}$

$=\frac {25}{18}$

$=\frac {13}{9}-\frac {2}{5}-\frac {4}{9}$

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

$=\frac {3}{5}$

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

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

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

$=\frac {9}{12}-\frac {2}{12}+\frac {4}{12}$

$=\frac {11}{12}$

$=\frac {7}{9}-\frac {4}{7}+\frac {2}{9}$

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

$=1-\frac {4}{7}$

$=\frac {3}{7}$

$=\frac {5}{3}-(\frac {2}{7}+\frac {5}{7})$

$=\frac {5}{3}-1$

$=\frac {2}{3}$

$=\frac {7}{5}-\frac {7}{9}-\frac {2}{5}+\frac {7}{9}$

$=(\frac {7}{5}-\frac {2}{5})+(\frac {7}{9}-\frac {7}{9})$

$=1-0$

$=1$

$=\frac {3}{8}+\frac {1}{16}+\frac {1}{32}+\frac {1}{64}+\frac {1}{128}+\frac {1}{256}$

$=1-\frac {1}{2}-\frac {1}{256}$

$=\frac {127}{256}$

$=(1000-\frac {1}{9})+(100-\frac {1}{9})+(10-\frac {1}{9})+\frac {1}{3}$

$=(1000+100+10)+(\frac {1}{9}+\frac {1}{9}+\frac {1}{9}-\frac {1}{3})$

$=1110$

$ \begin{aligned}解：42+2x&=92 \\ 2x&=50 \\ x&=25 \\ \end{aligned}$

$ \begin{aligned}解：1.2x&=18 \\ 1.2x÷1.2&=18 \\ x&=15 \\ \end{aligned}$

$ \begin{aligned}解：5x&=10.8 \\ 5x÷5&=10.8÷5 \\ x&=2.16 \\ \end{aligned}$

$ \begin{aligned}解：4x-18&=32 \\ 4x&=50 \\ x&=12.5 \\ \end{aligned}$

$ \begin{aligned}解：x&=\frac {17}{18}-\frac {2}{9} \\ x&=\frac {13}{18} \\ \end{aligned}$

$ \begin{aligned}解：x&=\frac {1}{3}+\frac {1}{4} \\ x&=\frac {7}{12} \\ \end{aligned}$

$0.53a$

$8.1b$

$9.8x$

$16.3y$

$2x$

$3y$

$\frac {5}{9}$

1

$\frac {3}{8}$

$\frac {4}{9}$

$\frac {1}{10}$

$\frac {31}{20}$

$\frac {9}{8}$

$\frac {5}{7}$