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第67页

信息发布者：

$\begin {aligned}解：x&=\frac {4}{5}-\frac {2}{7}\\x &=\frac {18}{35}\end {aligned}$

$\begin {aligned}解：x&=\frac {2}{3}+\frac {3}{5}\\x &=\frac {19}{15}\end {aligned}$

$\begin {aligned}解：x&=\frac {4}{7}-\frac {1}{2}\\x &=\frac {1}{14}\end {aligned}$

$\begin {aligned}解：x&=2-\frac {3}{8}\\x &=1 \frac {5}{8}\end {aligned}$

$\begin {aligned}解：x&=\frac {5}{6}-\frac {1}{4}\\x &=\frac {7}{12}\end {aligned}$

$\begin {aligned}解：x&=\frac {1}{2}+\frac {6}{7}\\x &=\frac {19}{14}\end {aligned}$

$=\frac {45}6-\frac {23}6+\frac {14}6$

$ =6$

$=\frac 34+\frac 14+(\frac 4{11}+\frac 7{11})$

$ =1+1$

$ =2$

$=2-(\frac 89+\frac 19)$

$ =2-1$

$ =1$

$=\frac 7{15}-\frac 2{15}-\frac 14$

$ =\frac 13-\frac 14$

$ =\frac 1{12}$

$=\frac {17}{10}-\frac 7{10}-\frac 14$

$ =1-\frac 14$

$ =\frac 34$

$=\frac 25+\frac 35-(\frac 17+\frac 67)$

$ =1-1$

$ =0$

$1-\frac 13-\frac 25=\frac 4{15}$

$答：去黄山旅游的占总人数的 \frac 4{15}。$

$\frac 23+\frac 12+\frac 13=\frac 32(吨)$

$答：运来大米 \frac 32吨。$