8. x=-1/10
9.4.25
Объяснение:
8.
4х²-5/4x+2=x-3
4x²-5=(x-3)(4x+2)
4x²-5=4x²+2x-12x-6
-5=2x-12x6
-5=-10x-6
10x=-1
x= -1/10
9.
x - 1/x=3
x/x - 1/x =3
x-1=3
x=2
x²+1/x²=2²+1/2²=4+1/4=4 1/4=17/4=4.25
8. x=-1/10
9.4.25
Объяснение:
8.
4х²-5/4x+2=x-3
4x²-5=(x-3)(4x+2)
4x²-5=4x²+2x-12x-6
-5=2x-12x6
-5=-10x-6
10x=-1
x= -1/10
9.
x - 1/x=3
x/x - 1/x =3
x-1=3
x=2
x²+1/x²=2²+1/2²=4+1/4=4 1/4=17/4=4.25