C^2-d^2-c+d = (c-d)(c+d)-(c-d) = (c-d)(c+d-1)
<span> y= -x2+4x+3
наименьшее это минус бесконечность
наибольшее при x=-b/2a=-4/-2=2
y=-4+8+3=7</span>
9y=(2sinx+3)/√x
u=2sinx+3 u'=2cosx
v=√x v'=1/2√x
(u/v)'=1/v²[u'v-v'u]=1/x[2√x*cosx-(2sinx+3)/2√x]
3*(2х + y - 1) = 5x + 4y +2
4*(x - 2y + 1) = 2x -5y +16
6x + 3y - 3 = 5x + 4y +2
4x - 8y + 4 = 2x -5y +16
6x - 5x + 3y - 4y = 2 + 3
4x - 2x - 8y + 5y = 16 - 4
x - y = 5
2x - 3y = 12
x = 5 +y
2*(5+y) - 3y = 12
10 + 2y - 3y = 12
-y = 12 - 10
-y = 2
y = -2
x = 5 - <span>2 = 3
</span>Ответ: <span>x = </span><span>3
</span> y = -2