\[\boxed{\mathbf{592\ (592)}.\ Еуроки\ - \ ДЗ\ без\ мороки}\]
\[\boxed{\mathbf{592}\mathbf{\ (545)}.\ Еуроки\ - \ ДЗ\ без\ мороки}\]
\(1)\ 14a \cdot 6b = 84ab\)
\[при\ a = 2;\ \ b = 3:\]
\[84 \cdot 2 \cdot 3 = 84 \cdot 6 = 504.\]
\(2)\ 25m \cdot 3n = 75mn\)
\[при\ m = 8;\ \ n = 1:\]
\[75 \cdot 8 \cdot 1 = 600.\]
\[3)\ 5x + 8x - 3x = 5x + 5x =\]
\[= 10x\]
\[при\ x = 17:\]
\[10x = 10 \cdot 17 = 170.\]
\[4)\ 16y - y + 5y = 15y + 5y =\]
\[= 20y\]
\[при\ y = 23:\]
\[20y = 20 \cdot 23 = 460.\]