第15页

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$ 1-\frac{2}{2+3}-\frac{2}{2+5}=\frac{11}{35}$
$210×\frac{11}{35}=66(盆)$
$答:粉蝶花有66盆。$
$\frac{5554}{4443}=1\frac{1111}{4443}$
$\frac{6668}{5557}=1\frac{1111}{5557}\ $
$\frac{7779}{6668}=1\frac{1111}{6668}$
$因为1\frac{1111}{4443}>1\frac{1111}{5557}>1\frac{1111}{6668},$
$即\frac{5554}{4443}>\frac{6668}{5557}>\frac{7779}{6668},$
$所以\frac{4443}{5554}<\frac{5557}{6668}<\frac{6668}{7779}。$