(5x^2 - 10xy + 5y^2) / (2x^2 - 2xy + 2y^2) : (8x - 8y) / (10x^3 + 10y^3) =
5(x^2 - 2xy + y^2) / 2(x^2 - xy + y^2) : 8(x -y) / 10(x^3 + y^3) =
5((x - y)(x - y)) / 2(x^2 - xy + y^2) : 8(x - y) / 10((x + y)(x^2 - xy + y^2))=
25((x - y)(x + y)) / 8 = (25(x^2 - y^2)) / 8
(a + b)^2 = a^2 + 2ab + b^2 ==>
(p + q)^2 = p^2 + 2pq + q^2
7x-8=4x-(1-3x)
7x-8=4x-1+3x
7x-8-4x+1-3x=0
7x-4x-3x-8+1=0
0x-7=0
0x=7
Решений нет
D = 64 - 4*4*3 = 64 - 48 = 16
V D = 4
X1 = ( 8 + 4 ) : 8 = 1.5
X2 = 4 : 8 = 0.5
4X^2 - 8X + 3 = ( X - 1.5)*(X - 0.5)
=(5х-5/5)(х+4)=(5х-1)(х+4)=5х^2+20х-х-4=5х^2+19х-4. Х=-19+√(19)^2-4•5•(-4)/2•5=19+√361+80/10=-19+21/10=2/10=1/5. Х2=-19-21/10=-4.