4х^2-5х+1=0
Д=25-16=9
х1=5-3/8=0,25
х2=5+3/8=1
10y - 1 - 25y² = - (25y² - 10y + 1) = - ((5y)² - 2 * 5y * 1 + 1²) = - (5y - 1)²
abc-abd = ab(c-d)
4cx-acx = cx(4-a)
xyz+yzd = yz(x+d)
ad+bd+cd = d(a+b+c)
4ab-2ac-6ad = 2a(2b-c-3d)
abx-acx-adx = ax(b-c-d)
8а^2b-5a^2b+4b^2+a^2b-5b^2+2=4a^2b-b^2+2))))