<span>z = 4(x-y)-x^2-y^2
</span>z = 4x-4y-x^2-y^2
{z'x = 4-2x
{z'y = -4-2y
{4-2x = 0
{-4-2y = 0
{x = 2
{y = -2
M(2; -2) - критическая точка
A = z''x(x0; y0) = -2
B = z''xy(x0; y0) = 0
C = z''y(x0; y0) = -2
AC-B² = (-2)*(-2)-0 = 4>0, A<0 - в точке M<span>(2;-2) максимум z(2;-2) = 8</span>
Ответ: Б й <em>получае</em><em>тся</em><em> </em><em>5</em><em> </em><em>точек</em><em> </em>
5/8 < 3/4 (=6/8),
2/3 (=6/9) < 7/9,
1/16 < 7/8 (=14/16),
7/9 (=14/18) < 17/18,
7/12 (=21/36) < 8/9 (=32/36),
2/9 (=20/90) > 1/10 (=9/90),
5/24 (=10/48) > 3/16 (=9/48),
1/20 (=3/60) < 2/15 (=8/60)
S=(ac+cb+ab)*2
(1/2*14+1/4*1 1/3+1/2*1 1/3)*2=(2/4+1/3+2/3)*2=1 1/2*2=3 это к 1 ответ
4/3*1/4*1/2=1<span>/3*1/1*1/2=1/6 это обьем </span>