1)10x^2-24x+16< 5x^2 2)(x-4)(x-6)> 0 3)7x+4< -8-8x

1){x+2y=1 {2x-y= -8            2){3x-2y=2 {2x+y=1   х=1-2у                                    y=1-2x   2*(1-2у)-у=-8                         3x-2*(1-2x)=2   2-4у-у=-8                              3x-2+4x=2   -5у=-8-2=-10                       7x=2+2=4   у=2                                       x=4/7                                  2х-2=-8                                2x+y=1   2х=-8+2                               2*4/7+y=1   2х=-6                                   8+7y=7    х=-6/2                                 7y=7-8=-1   х=-3                                   y=-1/7   (2х-1)^2=2x-1   4x^2-4x+1=2x-1   4x^2-4x-2x+1+1=0   4x^2-6x+2=0-поделим на 2   2x^2-3x+1=0   D=(-3)^2-4*2*1=9-8=1   x1=-(-3)+1/2*2=1   x2=-(-3)-1/2*2=1/2   (x-3)^2=4(x-3)   x^2-6x+9=4x-12   x^2-10x+21=0   D=(-10)^2-4*1*21=100-84=16   x1=10+4/2*1=7   x2=10-4/2*1=3   4(x-3)^2=(2x+6)^2   4(x^2-6x+9)=4x^2+24x+36   4x^2-24x+36=4x^2+24x+36   4x^2-24x+36-4x^2-24x-36=0   -48x=0   x=0   пусть v-корень   (3x+4)^2=3(x+4)   9x^2+24x+16=3x+12   9x^2+24x+16-3x-12=0   9x^2+21x+4=0   D=21^2-4*9*4=441-144=297   x1=-21+v297/2*9=-21+v297/18   x2=-21-v297/2*9=-21-v297/18