1.
А) 7ах^5·(-2а^4х)=-14a^5x^6
Б) (5а^3в)^2=25a^6b^2
2.
(2х-1)^2+(2х-1)(2х+1)=8x^2-4x
3.
А) b^2с-9c=-(9c-b^2)
Б) 2a^2+12a+18=2*(a+3)^2
В) x-y-2x^2+2y^2=(y-x)*(2y+2x-1)
4.
А) 3-4(1-6х)=2(3х+4)
-1+24x-6x-8=0
-9+18x=0
x=9/18
x=0.5
Б) (х+2)/3-4х=8
-11/3x-22/3=0
x=(22/3)/(-11/3)
x=-2
В) 3х^2+4х=0
D=4^2-4*3*0=16
x1=(4-4)/(2*3)=0
x2=(-4-4)/(2*3)=-4/3