а) 4z² - 4z +1 = 0
(2z)² - 4z +1 = (2z-1)²=0
2z-1 =0
z= 1/2
б) 2(x-2) + x(x-2)=0
(x-2)(2+x)=0
x=2 ; x= -2
в) x²(x-3)(x+6) = 0
х=0 ; х=3 ; х= -6
а) 4z² - 4z +1 = 0
(2z)² - 4z +1 = (2z-1)²=0
2z-1 =0
z= 1/2
б) 2(x-2) + x(x-2)=0
(x-2)(2+x)=0
x=2 ; x= -2
в) x²(x-3)(x+6) = 0
х=0 ; х=3 ; х= -6