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第73页

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$\frac {111}{1234}=\frac {666}{7404}$

$\frac {666}{7404}＞\frac {666}{7654}$

$\frac {111}{1234}＞\frac {666}{7654}$

$1-\frac {4443}{4445}=\frac {2}{4445}$

$1-\frac {5554}{5556}=\frac {2}{5556}$

$\frac {2}{4445}＞\frac {2}{5556}，$则$\frac {4443}{4445}＜\frac {5554}{5556}$

$\frac {223}{447}＜\frac 12，\frac {395}{788}＞\frac 12$

$\frac {223}{447}＜\frac {395}{788}$

$\frac {2346}{2345}=1+\frac {1}{2345}$

$\frac {2347}{2346}=1+\frac {1}{2346}$

$\frac {1}{2345}＞\frac {1}{2346}，$则$\frac {2346}{2345}＞\frac {2347}{2346}$

$ 2020×2024$

$=2020×(2023+1)$

$=2020×2023+2020$

$ 2023×2019$

$=2023×(2020-1)$

$=2023×2020-2023$

$2020×2024＞2023×2019$

所以$\frac {2020}{2023}＞\frac {2019}{2024}$