\[\boxed{\ \mathbf{430\ (430)}.\ Еуроки\ - \ ДЗ\ без\ мороки}\]
\[1)\ при\ x = 12,\ \ \ y = 11:\]
\[25x \cdot 4y = 100 \cdot x \cdot y =\]
\[= 100 \cdot 12 \cdot 11 = 100 \cdot 132 =\]
\[= 13\ 200.\]
\[2)\ при\ k = 58,\ \ \ c = 8:\]
\[8k \cdot 125c = 1000 \cdot k \cdot c =\]
\[= 1000 \cdot 58 \cdot 8 = 1000 \cdot 464 =\]
\[= 464\ 000.\]
\[\boxed{\mathbf{430}.\ }\]
\[ТРЕТЬЯК.\]