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電子課本網 › 第62頁

第62頁

信息發(fā)布者：
?$\frac {8}{15}$?
?$\frac 34$?
?$\frac {3}{50}$?
?$\frac {24}{25}$?
?$\frac {5}{12}=\frac {10}{24}，$??$\frac {3}{8}=\frac {9}{24}$?
?$\frac {10}{24}>\frac {9}{24}，$??$\frac {5}{12}>\frac {3}{8}$?
?$\frac {7}{15}=\frac {21}{45}，$??$\frac {5}{9}=\frac {25}{45}$?
?$\frac {21}{45}<\frac {25}{45}，$??$\frac {7}{15}<\frac {5}{9}$?
方法一：?$\frac {5}{7}=\frac {25}{35}，$??$\frac {3}{5}=\frac {21}{35}$?
?$\frac {25}{35}>\frac {21}{35}，$??$\frac {5}{7}>\frac {3}{5}$?
方法二：?$\frac 57≈0.71，$??$\frac 35=0.6$?
?$0.72＞0.6，$??$\frac {5}{7}>\frac {3}{5}$?
?$12÷15=\frac 45$?
?$(20-5)÷20=\frac 34$?
?$\frac 45＞\frac 34$?
答：小軍射得準一些。
?$\frac 14=\frac {5}{20}，$??$\frac 15=\frac {4}{20}，$??$\frac {3}{10}=\frac {6}{20}$?
?$\frac 15＜\frac 14＜\frac {3}{10}$?
答：應多進椰蓉面包。
答：這個帶分數是?$7\frac 89。$?
?$\frac {13}{84}、$??$\frac {25}{168}、$??$\frac {9}{56}$?
?$\frac {755}{756}=1-\frac {1}{756}$?
?$\frac {84}{85}=1-\frac {1}{85}$?
?$\frac {1243}{1244}=1-\frac {1}{1244}$?
?$\frac {16}{17}=1-\frac {1}{17}$?
?$\frac {1}{17}＞\frac {1}{85}＞\frac {1}{756}＞\frac {1}{1244}$?
所以?$\frac {16}{17}＜\frac {84}{85}＜\frac {755}{756}＜\frac {1243}{1244}$?
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