2(x-y)+x-y=2x-2y+x-y=3x-3y
1) x-(x-32+2x^2)=0
x-x+32-2x^2=0
-2x^2+32=0
-2x^2=-32
x^2=16
x1=4;x2=-4
B4=b1*q^3= -247*27= -6669
Ответ: -6669
2. v) 1/4=0.25
0.25x²-x+1=0
D=b²-4ac(a=0.25,b=-1,c=1)
D=1-1=0, при D=0
x1,x2=(-b+-0)/2a
x1=1/0.5=2. x2=-2
ответ: х=2
3.
(3x(x+1)+4(x-1))/(x-1)(x+1)=
=6/(x²-1)
(3x²+3+4x-4)/(x²-1)=6/(x²-1)
(3x²+4x-1-6)/(x²-1)=0
3x²+4x-7=0
D=16+84=100=10²
x1,x2=(-b+-корень изD)/2a
x1=(-4-10)/6=-14/6=-2 2/6=
=-2 1/3
x2=(-4+10)/6=1