9x 7 3x 2 4x 5. (X+5)^2-(X-5)^2. 2x+10=2-x. |X^2+7x|=4x+10. (7x+4)4x(5-2x). (X + 4)*(X - 13)^2 <= 0. X4-13x2+36 0. Х2-13х-36=0. 2x-(36-x)=0 решение. X3+2x2-5x-6 0. 3x^2-x^3=0. (-X-7)^5(4-2x)(x-3)^2<0. 2x 4-7x 2+5 0. (2x+3y)2-3x(4/3. 4x+3y при x -3/4 y -1/6