Wyznacz cztery kolejne liczby całkowite, takie że największa z nich jest równa sumie kwadratów trzech pozostałych liczb
" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
[/tex]
Zastosowano wzor skroconego mnozenia:
(a+b)^2=a^2+2ab+b^2
Oznaczam kolejne liczby: n, n+1, n+2, n+3, n ∈ C
n² + (n+1)² + (n+2)² = n+3
n²+n²+2n+1+n²+4n+4 = n=3
3n²+5n+2 = 0
Δ = b²-4ac = 25-24 = 1
√Δ = √1 = 1
n1 = (-b-√Δ)/2a = (-5-1)/6 = -1
n2 = (-b+√Δ)/2a = (-5+1)/6 = -2/3 ∉ C
n = -1
n+1 = -1+1 = 0
n+2 = -1+2 = 1
n+3 = -1+3 = 2
Odp. Szukane liczby to: -1, 0, 1, 2.