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$\begin {aligned}&\frac {7}{9}=\frac {14}{18},\frac {5}{6}=\frac {15}{18}\\&\frac {14}{18}<\frac {15}{18},\frac {7}{9}<\frac {5}{6}\end {aligned}$
$\begin {aligned}&\frac {1}{12}=\frac {4}{48},\frac {7}{16}=\frac {21}{48}\\&\frac {4}{48}<\frac {21}{48},\frac {1}{12}<\frac {7}{16}\end {aligned}$
$\begin {aligned}&\frac {7}{18}=\frac {14}{36},\frac {11}{36}=\frac {11}{36}\\&\frac {14}{36}>\frac {11}{36},\frac {7}{18}>\frac {11}{36}\end {aligned}$
$\begin {aligned}&\frac {13}{24}=\frac {39}{72},\frac {17}{18}=\frac {68}{72}\\&\frac {39}{72}<\frac {68}{72},\frac {13}{24}<\frac {17}{18}\end {aligned}$
$\frac {2}{5},\frac {4}{9},\frac {1}{3},\frac {5}{12}$
$\frac {6}{19}$
$\frac {3}{4},\frac {5}{6},\frac {6}{11},\frac {7}{10}$
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B
C
C
C
答:橙汁要多进。因为$ \frac {3}{10}=\frac {18}{60},$$\frac {8}{15}=\frac {32}{60},$$\frac {7}{12}=\frac {35}{60},$
$\frac {35}{60} >\frac {32}{60} > \frac {18}{60}$
即$ \frac {7}{12} > \frac {8}{15} > \frac {3}{10},$所以橙汁要多进。
小红:$\frac {2}{5}$
小芳:1-$\frac {4}{7}$=$\frac {3}{7}$
小丽:$\frac {4}{4+6}$=$\frac {2}{5}$
$\frac {3}{7}$ > $\frac {2}{5}$
答:现在小芳看的页数最多。
B
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