第55页 - 亮点给力提优课时作业本五年级数学江苏版

$\frac{5}{8}$

$\frac{2}{9}$

$\frac{1}{9}$

$\frac{8}{7}$

$\frac{3}{5}$

$3\frac{1}{4}$

$\frac{7}{10}$

$2 {\frac{3} {4}}$

$=\frac {3}{4}-\frac {17}{24}$

$=\frac {1}{24}$

$=(\frac {4}{7}-\frac {3}{7})+(\frac {7}{8}+\frac {1}{8})$

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

$=\frac {8}{7}$

$=\frac {3}{5}+\frac {7}{5}+\frac {7}{6}$

$=2+\frac {7}{6}$

$=\frac {19}{6}$

$=3-(\frac {6}{11}+\frac {7}{11}+\frac {9}{11})$

$=3-2$

$=1$

$=\frac {2}{7}+(\frac {4}{5}-\frac {1}{2})$

$=\frac {20}{70}+\frac {56}{70}-\frac {35}{70}$

$=\frac {41}{70}$

$=1+1-\frac {1}{16}$

$=1\frac {15}{16}$

$ \begin{aligned} 解：0.4x&=10 \\ x&=25 \\ \end{aligned}$

$ \begin{aligned} 解：5x+1&=65 \\ 5x&=64 \\ x&=12.8 \\ \end{aligned}$

$ \begin{aligned}解：3x+8.5&=10 \\ 3x&=1.5 \\ x&=0.5 \\ \end{aligned}$

$ \begin{aligned}解：0.4x&=1 \\ x&=2.5 \\ \end{aligned}$