Решите уравнения: 1. x^2=8x-17 2. 14x=-49-x^2 3. 36+17x=-2x^2 4. 7x^2-3x=4 5,6x=9x^2=-1 6. 0,81-x^2=0 7. 5x+9x^2=0 8,1+2x=8x^2 9.…

x^2-8x+17=0 => D=64-4*17=Р Н 4x=-49-x^2 => x^2+4x+49=0 => D=16-4*49=Р Н36+17x=2x^2 => 2x^2+17x+36=0 => D=289-288=1 => x1=-9/2 => x2=-47x^2-3x=4 => D9-4*7*(-4)=121 => x1=1 => x2=-9/14x^2=81 => x=+-95x+9x^2=0 => x (5+9x)=0 => x=0 или x=-5/91+2x=8x^2 => 8x^2-2x-1=0 => D=4-4*8*(-1)=36 => x1=1/2 => x2=-1/419x-6x^2-10=0 => 6x^2-19x+10=0 => D=361-4*6*10=121 => x1=30/38 => x2=8/388+2x^2=0 => 2x^2=-8 => x^2=-4 => x=Р Н40x-25x^2+12x=0 => 28-25x^2=0 => x (28-25x)=0 => x=0 или 25x=28 => x=28/25