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第25页

信息发布者：

$\frac{1}{42}$

$2\frac{1}{12}$

$2\frac{5}{6}$

0.49

$1\frac{2}{3}$

0.75

18.84

$=\frac {1}{2}+\frac {2}{3}$

$=\frac {7}{6}$

$=\frac {23}{21}-\frac {2}{21}-\frac {5}{9}$

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

$=\frac {4}{9}$

$=(\frac {5}{6}+\frac {1}{6})+(\frac {2}{5}+\frac {3}{5})$

$=1+1$

$=2$

$=1-\frac {1}{2}+\frac {1}{2}-\frac {1}{4}+\frac {1}{4}-\frac {1}{8}+\frac {1}{8}-\frac {1}{16}+\frac {1}{16}-\frac {1}{32}$

$=1-\frac {1}{32}$

$=\frac {31}{32}$

$\begin {aligned}解：1.3x&=0.6+0.44\\1.3x&=1.04\\x &=0.8\end {aligned}$

$\begin {aligned}解：54x&=144\\x &=\frac {8}{3}\end {aligned}$

$\begin {aligned}解：x&=\frac {5}{9}-\frac {3}{7}\\x &=\frac {8}{63}\end {aligned}$

0.375

$\frac {3}{5}$

$\frac {1}{8}$

$\frac {7}{100}$

$\frac {3}{4}$