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信息发布者：
A
C
A
B
$\begin {aligned}解：x&=\frac {8}{7}-\frac {3}{4}\\x &=\frac {11}{28}\end {aligned}$
$\begin {aligned}解：x&=\frac {1}{8}+\frac {11}{24}\\x &=\frac {7}{12}\end {aligned}$
$\begin {aligned}解：x&=\frac {8}{9}-\frac {5}{6}\\x &=\frac {1}{18}\end {aligned}$
$\begin {aligned}解：x&=1+\frac {1}{6}\\x &=1 \frac {1}{6}\end {aligned}$
​$=(\frac {10}{19}+\frac {9}{19})+(\frac {9}{10}+\frac {1}{10})$​
​$=1+1$​
​$=2$​
​$=(\frac {7}{5}-\frac {2}{5})-\frac {2}{7}$​
​$=1-\frac {2}{7}$​
​$=\frac {5}{7}$​
​$=(\frac {11}{8}-\frac {3}{8})-(\frac {3}{10}+\frac {7}{10})$​
​$=1-1$​
​$=0$​
​$=1-\frac {1}{2}+\frac {1}{2}-\frac {1}{3}+\frac {1}{3}-\frac {1}{4}+...+\frac {1}{9}-\frac {1}{10}$​
​$=1-\frac {1}{10}$​
​$=\frac {9}{10}$​
 甲杯：25÷(100+25)=​$\frac {1}{5}$​
乙杯：15÷(75+15)=​$\frac {1}{6}$​
​$\frac {1}{5}$​ > ​$\frac {1}{6}$​
答：甲杯的糖水甜一些。
( ​$\frac {3}{4}$​ + ​$\frac {5}{8}$​ )-​$\frac {1}{16}$​=​$\frac {21}{16}$​ (吨)
答：第三天烧了​$\frac {21}{16}$​吨。
​$(57+62)÷(12+5)=7 $​
​$\frac {5×7}{12×7}$​=​$\frac {35}{84}$​
​$57-35=22$​或​$84-62=22$​
答：减去或加上的这个数是​$22。$​
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