ГДЗ по математике 5 класс Мерзляк Задание 545

\[\boxed{\mathbf{545\ (545)}.\ Еуроки\ - \ ДЗ\ без\ мороки}\]

\(1)\ 14a \cdot 6b = 84ab\)

\[при\ a = 2;\ \ b = 3:\]

\[84 \cdot 2 \cdot 3 = 84 \cdot 6 = 504.\]

\(2)\ 25m \cdot 3n = 75mn\)

\[при\ m = 8;\ \ n = 1:\]

\[75 \cdot 8 \cdot 1 = 600.\]

\[3)\ 5x + 8x - 3x = 5x + 5x =\]

\[= 10x\]

\[при\ x = 17:\]

\[10x = 10 \cdot 17 = 170.\]

\[4)\ 16y - y + 5y = 15y + 5y =\]

\[= 20y\]

\[при\ y = 23:\]

\[20y = 20 \cdot 23 = 460.\]