X1*x2 = 3/2
X1 + x2= 7/2
3x = 3
А) (2a – 5b) + (-3a + 2b)=<span>2a – 5b -3a + 2b = -а-2в
в)</span>(2a – 3x) + (-13a + 5x)=<span>2a – 3x -13a + 5x = 2х-11а
г) </span>(-3x2 + 6x – 1) – (-2x2 + 3x – 1)= <span>-3x2 + 6x – 1 – 2x2 - 3x + 1= -5х2+3х
д) </span>– (5a2 – 10a + 12) – (3a2 + 10a – 7) =<span>– 5a2 +10a - 12 – 3a2 - 10a +7=-8а2-5
ж) </span>(- 2a + 13b) + (2a – 13b)=<span>- 2a + 13b + 2a – 13b=0
е) </span>– (5,2x – y) + (3,2x – 4y)=<span>– 5,2x + y + 3,2x – 4y=-2х-3у
Как-то так </span>
9/(x+2)^2 >=1
9/(x+2)^2-1 >=0
9-(x+2)^2/(x+2)^2>=0
(x+5)(-x+1)/(x+2)^2>=0
=>
(x+5)=0
(x-1)=0
(x+2)^2=0
x=-5
x=1
x=-2
[-5;-2)U(-2;1]
2x-12x-36>=-3
2x-12x>=-3+36
-10x>=-3+36
-10x>=33
x>=-3,3