1) $$(\frac{7}{10} - \frac{4}{10})^2 - \frac{3}{10}^2 + \frac{9}{100} = (\frac{3}{10})^2 - \frac{9}{100} + \frac{9}{100} = \frac{9}{100} - \frac{9}{100} + \frac{9}{100} = \frac{9}{100}$$
Ответ: $$\frac{9}{100}$$