\[\boxed{\text{77.}}\]
\[1000,\ 999,\ 998,\ 997,\ 996,\ 995,\ \]
\[994,\ 993.\]
\[385,\ 386,\ 387,\ 388,\ 389,\ 390,\ \]
\[391,\ 392.\]
\[\boxed{\text{78.}}\]
\[Четные\ числа:\]
\[48,\ 190,\ 112,\ 618.\]
\[Нечетные\ числа:\]
\[603,\ 69,\ 247,\ 875,\ 5,\ 25,\ 7,\ 151.\]
\[\boxed{\text{79.}}\]
\[810 = 81\ дес.\]
\[350 = 35\ дес.\]
\[640 = 64\ дес.\]
\[720 = 72\ дес.\]
\[930 = 93\ дес.\]
\[280 = 28\ дес.\]
\[\boxed{\text{80.}}\]
\[242;803;400;370;798;503.\]