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第107頁

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?$ \frac {1}{2} $?
?$ \frac {3}{7} $?
?$ \frac {3}{10} $?
?$ \frac {2}{7} $?
?$ \frac {2}{7} $?
4
?$ \frac {7}{10} $?
?$ \frac {5}{3} $?
?$=(\frac {5}{8}+\frac {3}{8})+(\frac {7}{11}+\frac {4}{11})$?
?$=1+1$?
?$=2$?
?$=4 ×\frac {9}{4}-\frac {4}{9} ×\frac {1}{4}$?
?$=9-\frac {1}{9}$?
?$=8 \frac {8}{9}$?
?$=\frac {5}{9} ×\frac {1}{6}+\frac {4}{9} ×\frac {1}{6}$?
?$=(\frac {5}{9}+\frac {4}{9}) ×\frac {1}{6}$?
?$=\frac {1}{6}$?
?$=(54 \div 9)$?：?$(45 \div 9)$?
?$=6$?：?$ 5$?
?$=\frac 65$?
?$=\frac {68 \div 17}{51 \div 17}$?
?$=4$?：?$3$?
?$=\frac {4}{3}$?
?$=36$?：?$90$?
?$=2$?：?$ 5$?
?$=\frac 25$?
?$=(\frac {1}{2} ×16)$?：?$(\frac {1}{16} ×16)$?
?$=8$?：?$ 1$?
?$=8$?
48
300
3.2
5
6
6
5
54
27
50
27
50
20
75
5
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