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第23页
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4
$\frac {2}{27}$
$\frac {4}{21}$
$\frac {3}{4}$
$\frac {9}{4}$
16
9
0
=3:5
=0.6
=3:2
=1.5
$=18:5$
$=\frac {18}{5}$
$=\frac {15}{2}×4×\frac {7}{25}$
$=\frac {42}{5}$
$=\frac {20}{9}×\frac {4}{5}×\frac {1}{8}$
$=\frac {2}{9}$
$=\frac {2}{3}×\frac {50}{9}×\frac {6}{5}$
$=\frac {40}{9}$
$=\frac {5}{8}×\frac {1}{10}×\frac {4}{5}$
$=\frac {1}{20}$
$=\frac {2}{7}×\frac {14}{15}×10$
$=\frac {8}{3}$
$=\frac {1}{12}×4×\frac {5}{3}$
$=\frac {5}{9}$
解:3x+19=82
3x=63
x=21
解:4×5×x=50
20x=50
x=2.5
解:$\frac {3}{5}x=24$
$x=40$
解:$\frac {3}{8}x=\frac {2}{5}$
$x=\frac {16}{15}$
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