Ответ:
Пошаговое объяснение:
a) 3/(x²-2x-2)-(x²-2x)=0
x²-2x=t
3/(t-2)-t=0
(3-t(t-2))/(t-2)=0
(3-t²+2t)/(t-2)=0
{3-t²+2t=0
{t-2≠0 t≠2
t²-2t-3=0
t₁+t₂=2 t₁t₂=-3 t₁=-1 t₂=3
t=-1 x²-2x=-1
x²-2x+1=0 (x-1)²=0 x=1
t=3 x²-2x=3
x²-2x-3=0 x₁=-1 x₂=3 ответ: -1 1 3
б)x/(x²-2)=t (x²-2)/x=1/t
t+6/t=7
(t²+6-7t)/t=0
{t²-7t+6=0 t₁+t₂=7 t₁t₂=6 t₁=1 t₂=6
{t≠0
t=1 x/(x²-2)=1
x=x²-2 x²-x-2=0 x₁+x₂=1 x₁x₂=-2 x₁=-1 x₂=2
t=6 x/(x²-2)=6
x=6(x²-2) x=6x²-12 6x²-x-12=0
D=1+288=289 x₁=(1-17)/12=-4/3 x₂=(1+17)/12=3/2
ответ: -4/3 -1 3/2 2
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Answers & Comments
Ответ:
Пошаговое объяснение:
a) 3/(x²-2x-2)-(x²-2x)=0
x²-2x=t
3/(t-2)-t=0
(3-t(t-2))/(t-2)=0
(3-t²+2t)/(t-2)=0
{3-t²+2t=0
{t-2≠0 t≠2
t²-2t-3=0
t₁+t₂=2 t₁t₂=-3 t₁=-1 t₂=3
t=-1 x²-2x=-1
x²-2x+1=0 (x-1)²=0 x=1
t=3 x²-2x=3
x²-2x-3=0 x₁=-1 x₂=3 ответ: -1 1 3
б)x/(x²-2)=t (x²-2)/x=1/t
t+6/t=7
(t²+6-7t)/t=0
{t²-7t+6=0 t₁+t₂=7 t₁t₂=6 t₁=1 t₂=6
{t≠0
t=1 x/(x²-2)=1
x=x²-2 x²-x-2=0 x₁+x₂=1 x₁x₂=-2 x₁=-1 x₂=2
t=6 x/(x²-2)=6
x=6(x²-2) x=6x²-12 6x²-x-12=0
D=1+288=289 x₁=(1-17)/12=-4/3 x₂=(1+17)/12=3/2
ответ: -4/3 -1 3/2 2