5x 1 2 8x 5. X3 и x5. 8-7x ⩾3x+5. 7+8x=-2x-5. (X+5)^2-(X-5)^2. 3(X-2)=X+2. (X-3)(X+3). X_X 2. (2x-3)(2x+3). 2\3х +5\6х-7\9х=1\2. 1/5х+4=2 1/3. Х/3+Х-1/2=4. 4/(Х-3)+1/Х= 5/(Х-2). Y=X^2-5x+6/x-3. Система x2+y2 25 XY 12. Y=3x2-6x+5. 3x3-27x=0. 5x2= 8x +4решение