1)3
2)a)2x + 3 > 0; 2x > -3; x > -3/2;
б)-28х - 7 >= 0; -28x >= 7; x >= 7 / -28; x >= -1/4;
в)2-5х < 11; -5x < 11 - 2; -5x < 9; x < -9/5;
г)6x-3 <= 4x; 6x - 4x <= 3; 2x <= 3; x <= 3/2;<br>3)a)-6(-9-x)+7x<=3x+2;<br>54 + 6x + 7x <= 3x + 2;<br>13x - 3x <= 2 - 54;<br>10x <= -52;<br>x <= -5.2;<br>б)(5-z)/3 >= (3-2z)/5;
((5-z)*5)/15 - ((3 - 2z)*3)/15 >= 0;
(25 - 5z)/15 - (9 - 6z)/15 >= 0;
(25 - 5z - 9 + 6z)>=0;
z + 16 >= 0;
z >= -16;
в)(x-4)^2<=x^2+5x-17;<br>x^2 + 16 - 8x <= x^2 +5x - 17;<br>16 + 17 <= 5x + 8x;<br>33 <= 13x;<br>x >= 33/13;
Я устал, прости.