\[\boxed{\text{127.}}\]
\[10 > 9\]
\[20 - 2 = 18 < 32 - 12 = 20\]
\[100 < 999\]
\[80 + 12 = 92\]
\[40 + 8 = 24 + 24\]
\[568 < 601\]
\[100 - 50 = 50\]
\[801 < 810\]
\[\boxed{\text{128.}}\]
\[1)\ 500 + 3 = 503\]
\[2)\ 710 + 20 = 730\]
\[3)\ 360 - 40 = 320\]
\[4)\ 830 - 30 = 800\]
\[5)\ 70 + 220 = 290\]
\[6)\ 427 - 27 = 400\]