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第64頁

信息發(fā)布者：
?$\frac {3}{2}$?
?$\frac {3}{5}$?
?$\frac {7}{9}$?
?$\frac {5}{6}$?
?$\begin {aligned}&\frac {1}{4}=\frac {4}{16}，\frac {7}{16}=\frac {7}{16}\\&\frac {4}{16}<\frac {7}{16}，\frac {1}{4}<\frac {7}{16}\end {aligned}$?
?$\begin {aligned}&\frac {7}{24}=\frac {21}{72}，\frac {5}{36}=\frac {10}{72}\\&\frac {21}{72}>\frac {10}{72}，\frac {7}{24}>\frac {5}{36}\end {aligned}$?
A
C
13
0.018秒< ?$\frac {1}{5}$? 秒< ?$\frac {9}{25}$? 秒< 7.2秒
6
25
3
34
1
客廳
10
?$\frac {2}{3}$?=?$\frac {6}{9}$?，因?yàn)??$\frac {6}{9}$? > ?$\frac {5}{9}$?，所以 ?$\frac {5}{9}$? < ?$\frac {2}{3}$?。
答：小明的比賽成績(jī)好一些。
?$15÷(8-3)=3 $?
?$\frac {3×3}{8×3}$?=?$\frac {9}{24}$?
答：這個(gè)分?jǐn)?shù)原來是?$\frac {9}{24}。$?
?$21-11=10 $?
?$7-5=2 $?
?$10÷2=5$?
?$\frac {5}{7}$?=?$\frac {5×5}{7×5}$?=?$\frac {25}{35}$? 
?$25-11=14$?或?$35-21=14$?
答：加上的這個(gè)數(shù)是?$14。$?
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