N=F*V
V=N/V=1200/300=40 м/с
16x^5y^4zxxz^4+14xyz^4xx^5y^2zy-7x^7yz^2yz^2yyz=
=16x^7y^4z^5+14x^7y^4z^5-7x^7y^4z^5=23x^7y^4z^5
x+53/x+3+4=0