1)0,8x(5x-0,7)+0,4<4x^2-12<br> -0,64x+0,4x<-12<br> -0,24x<-12<br> X>50
2)9x^2-11>9x(x-2)-3
-11>-18x-3
18x>-3+11
18x>8
X=4/9
3)(4x-5)(6-3x)-4<(1-2x)(7+6x)<br>24x -30+15x-4<7+6x-14x<br>39x-34<7-8x<br>47x<41<br>X=41/47
4)(1,8x+1)(5x-1)-2,2x>9x^2-4
-1,8x+5x-1-2,2x>-4
X-1>-4
X>-4+1
X>-3
1)28х+24х-52х=0 ответ:х€R
2) 11/10 x^4-11/10 x^3=0 X^3=0 x-1=0
X1=0
X2=1
3) -2y^3-2y^4=4y^4
-2y^3-6y^4=0
Y^3=0
1+3y=0
y1=1/3
Y2=0