h^2=13^2-5^2=169-25=144
h=12
V=1/3hS=4*(5sqrt(2))^2=4*50=200
(4x - 3y)^2 - (2x + y)(3x - 5y)
(16x^2 - 24xy + 9y^2) - (6x^2 - 10xy + 3xy - 5y^2)
16x^2 - 24xy +9y^2 - 6x^2 + 10xy - 3xy + 5y^2
10x^2 + 14y^2 - 17xy
10x^2 - 17xy + 14y^2
<u>Ответ: 10x^2 - 17xy + 14y^2</u>