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第25頁(yè)

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$\frac{1}{42}$
$2\frac{1}{12}$
$2\frac{5}{6}$
0.49
$1\frac{2}{3}$
1
0.75
18.84
?$=\frac {1}{2}+\frac {2}{3}$?
?$=\frac {7}{6}$?
?$=\frac {23}{21}-\frac {2}{21}-\frac {5}{9}$?
?$=1-\frac {5}{9}$?
?$=\frac {4}{9}$?
?$=(\frac {5}{6}+\frac {1}{6})+(\frac {2}{5}+\frac {3}{5})$?
?$=1+1$?
?$=2$?
?$=1-\frac {1}{2}+\frac {1}{2}-\frac {1}{4}+\frac {1}{4}-\frac {1}{8}+\frac {1}{8}-\frac {1}{16}+\frac {1}{16}-\frac {1}{32}$?
?$=1-\frac {1}{32}$?
?$=\frac {31}{32}$?
$\begin {aligned}解：1.3x&=0.6+0.44\\1.3x&=1.04\\x &=0.8\end {aligned}$
$\begin {aligned}解：54x&=144\\x &=\frac {8}{3}\end {aligned}$
$\begin {aligned}解：x&=\frac {5}{9}-\frac {3}{7}\\x &=\frac {8}{63}\end {aligned}$
9
6
64
0.375
?$\frac {3}{5}$?
?$\frac {1}{8}$?
?$\frac {7}{100}$?
?$\frac {3}{4}$?
13
11
5
19
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