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Вариант 1.
$\displaystyle \frac{0.18}{0.2}-1 \frac{1}{4}= \frac{18}{100}: \frac{2}{10}- \frac{5}{4}= \frac{18\cdot10}{100\cdot2}- \frac{5}{4}= \frac{9}{10}- \frac{5}{4}= \\ \\ \frac{9\cdot2-5\cdot5}{5\cdot4}= \frac{18-25}{20}=- \frac{7}{20}=- \frac{7\cdot5}{20\cdot5}=- \frac{35}{100}=-0.35$
Вариант 2.
$\displaystyle \frac{0.18}{0.2}-1 \frac{1}{4}=\frac{0.18\cdot100}{0.2\cdot100}- \frac{5}{4}=\frac{18}{20}-\frac{5}{4}= \frac{18-5\cdot5}{20}=- \frac{7}{20}= \\ \\ - \frac{7\cdot5}{20\cdot5}=-\frac{35}{100}=-0.35$