Х²-17х+52=0
D=289-208=81=9^2
x=(17+-9)/2
x1=4
x2=13
5х - 8 = π + 2πк, к ∈Z
5x = π + 2πk + 8, k ∈Z
x = π/5 +2πк/5 + 8/5, к∈Z
Промежутки не успела написать))
1) НОЗ: 6(n-5)(n+5)
2 / 3(n-5) = 2*2(n+5) / 6(n-5)(n+5) = 4n+20 / 6(n-5)(n+5)
1 / 2(n+5) = 3(n-5) / 6(n-5)(n+5) = 3n-15 / 6(n-5)(n+5)
2) НОЗ: 6(b+1)
a / 2(b+1) = 3a / 6(b+1)
x / 3(1+b) = 2x / 6(b+1)