$\frac{5554}{4443}=1\frac{1111}{4443}，$$\frac{6668}{5557}=1\frac{1111}{5557}，$
$\frac{7779}{6668}=1\frac{1111}{6668}。$
因?yàn)?1\frac{1111}{4443}＞1\frac{1111}{5557}＞1\frac{1111}{6668}，$
即$\frac{5554}{4443}＞\frac{6668}{5557}＞\frac{7779}{6668}，$所以$\frac{4443}{5554}＜\frac{5557}{6668}＜\frac{6668}{7779}。$
