\[\boxed{\mathbf{287}.}\]
\[1)\ \left( x^{2} + 3x - 4 \right)\ :(x + 4)\]
\[2)\ \left( x^{2} - 7x + 10 \right)\ :(x - 5)\]
\[3)\ \left( 6x^{3} + 7x^{2} - 6x + 1 \right)\ :\]
\[:(3x - 1)\]
\[4)\ \left( 4x^{3} - 5x^{2} + 6x + 9 \right)\ :\]
\[:(4x + 3)\]