3x-1-(x-4)=-(4-x)-1
3x-1-x+4+4-x+1=0
x=-8
(x^2-4x+3)(x-5)=x^3-4x^2+3x-5x^2+20x-15=x^3-9x^2+23x-15
1.6(5x-1)=1,8x-4
8x-1,6=1,8x-4
6,2x=2,4
X=2,4/6,2=1,2/3,1
<span>а) (x-3)^2-x(x+2.7)=9
x</span>²-6x+9-x²-2.7x=9
<span>-8.7x=0
x=0
б) 9y^2-25=0
(3y-5)(3y+5)=0
y</span>₁=5/3=1 2/3
y₂=-5/3=-1 2/3