\[\boxed{\mathbf{431\ (431).}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[= \frac{55 - 34}{10} = \frac{21}{10} = 2\frac{1}{10} = 2,1\]
\[\boxed{\mathbf{431}.}\]
\[1)\ 46,52 = 46\frac{52}{100}\]
\[2)\ 0,68 = \frac{68}{100}\]
\[3)\ 0,234 = \frac{234}{1000}\]
\[4)\ 0,007 = \frac{7}{1000}\]