Марат 5, диана 20, Руслан 10
1. [-6;1] (3; +~)
2. (-~ ;-1] (5; 9)
3. [-2; 0) (0; 2] [2; 4)
4. (-10; -7) (-7; 11]
5y+9<=3-7y
5y+7y<=3-9
12y<=-6
y<=-6/12
y<=-1/2
3x+1<=4x-5
3x-4x<=-5-1
-x<=-6
x<=6
1/4-y/3>=1/3-y
y-y/3>=1/3-1/4
(3y-y)/3>=(4-3)/12
2y/3>=1/12
2y>=3/12
2y>=1/4
y>=1/8
6y>3y-2
6y-3y>-2
3y>-2
y>-2/3
3-7y>5y-3
3+3>5y+7y
6>12y
y<6/12
y<1/2
x/6+1/2>x-1/3
1/2+1/3>x-x/6
(3+2)/6>(6x-x)/6
5/6>5x/6
x<5/6*6/5
x<0
10 дм - 3 дм 7 см - 2 дм 8 см = 9 дм 9 см