5- ( ТУТ вообще правильного нету если не считать что наименьшее значение функции МИНУС 3 )
6- А2 Б1 В4 а тут я 100% уверен
В <span>y(5y+2x) - (x+y)^2 </span>получилось 23 ответ.
![\frac{1}{(x-2)(x-3)} + \frac{1}{(x-2)(x-4)} + \frac{1}{x^{2}-7x+12} <=1](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7B%28x-2%29%28x-3%29%7D+%2B+%5Cfrac%7B1%7D%7B%28x-2%29%28x-4%29%7D+%2B+%5Cfrac%7B1%7D%7Bx%5E%7B2%7D-7x%2B12%7D+%3C%3D1)
![\frac{1}{(x-2)(x-3)} + \frac{1}{(x-2)(x-4)} + \frac{1}{(x-4)(x-3)} <=1](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7B%28x-2%29%28x-3%29%7D+%2B+%5Cfrac%7B1%7D%7B%28x-2%29%28x-4%29%7D+%2B+%5Cfrac%7B1%7D%7B%28x-4%29%28x-3%29%7D+%3C%3D1)
![\frac{1}{(x-2)(x-3)} + \frac{1}{(x-2)(x-4)} + \frac{1}{(x-4)(x-3)} - 1 <= 0](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7B%28x-2%29%28x-3%29%7D+%2B+%5Cfrac%7B1%7D%7B%28x-2%29%28x-4%29%7D+%2B+%5Cfrac%7B1%7D%7B%28x-4%29%28x-3%29%7D+-+1+%3C%3D+0)
![\frac{(x-4)+(x-3)+(x-2)-(x-2)(x-3)(x-4)}{(x-2)(x-3)(x-4)} <=0](https://tex.z-dn.net/?f=%5Cfrac%7B%28x-4%29%2B%28x-3%29%2B%28x-2%29-%28x-2%29%28x-3%29%28x-4%29%7D%7B%28x-2%29%28x-3%29%28x-4%29%7D+%3C%3D0)
![\frac{x-4+x-3+x-2-(x-2)(x-3)(x-4)}{(x-2)(x-3)(x-4)} <=0](https://tex.z-dn.net/?f=%5Cfrac%7Bx-4%2Bx-3%2Bx-2-%28x-2%29%28x-3%29%28x-4%29%7D%7B%28x-2%29%28x-3%29%28x-4%29%7D+%3C%3D0)
![\frac{(3x-9)-(x-2)(x-3)(x-4)}{(x-2)(x-3)(x-4)} <=0](https://tex.z-dn.net/?f=%5Cfrac%7B%283x-9%29-%28x-2%29%28x-3%29%28x-4%29%7D%7B%28x-2%29%28x-3%29%28x-4%29%7D+%3C%3D0)
![\frac{3(x-3)-(x-2)(x-3)(x-4)}{(x-2)(x-3)(x-4)} <=0](https://tex.z-dn.net/?f=%5Cfrac%7B3%28x-3%29-%28x-2%29%28x-3%29%28x-4%29%7D%7B%28x-2%29%28x-3%29%28x-4%29%7D+%3C%3D0)
![\frac{(x-3)(3-(x-2)(x-4)}{(x-2)(x-3)(x-4)} <=0](https://tex.z-dn.net/?f=%5Cfrac%7B%28x-3%29%283-%28x-2%29%28x-4%29%7D%7B%28x-2%29%28x-3%29%28x-4%29%7D+%3C%3D0)
Учитывая, что х не равно 3, получаем:
![\frac{-x^{2}+6x-5}{(x-2)(x-4)} <=0](https://tex.z-dn.net/?f=%5Cfrac%7B-x%5E%7B2%7D%2B6x-5%7D%7B%28x-2%29%28x-4%29%7D+%3C%3D0)
![\frac{(x-1)(x-5)}{(x-2)(x-4)} <=0](https://tex.z-dn.net/?f=%5Cfrac%7B%28x-1%29%28x-5%29%7D%7B%28x-2%29%28x-4%29%7D+%3C%3D0)
x=1 х=2 х=4 х=5. (помним, что х не равно 3).
Отмечаем корни на оси х и выясняем знак неравенства.
Корнями являются значения 1<=х<2, 4<x<=5
<em>Ответ. 1<=х<2, 4<x<=5</em>
(4√3)²=16*3=48
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