2 zadania do zrobienia, zadanie 2 i 3 :)
Zad.2
-6
f(x) = ---------
x + 4
Funkcja homograficzna
a = 0, b = -6, c = 1, d = 4
a)
x+4 ≠ 0
x ≠ -4
D = R \ {-4}
========
b)
f(2) = -6/(2+4) = -6/6
f(2) = -1
======
c)
f(x) = 6
6 = -6/(x+4) I*(x+4)
6(x+4) = -6
6x + 24 = -6
6x = -6 - 24
6x = -30 /:6
x = -5
====
Odp. Dla argumentu: -5
d)
y ∈ R \ {a/c}
y ∈ R \ {0}
Zbiór wartości: R \ {0}
1 ∈ ZW
Zad.3
c = 8 - przeciwprostokątna
sinx = √2/2
a,b - przyprostokątne
P = ?
Obw. = ?
a/c = sinx
a = c·sinx
a = 8 · √2/2
a = 4√2
----------
Z tw. Pitagorasa:
a²+b² = c²
b² = c²-b² = 8²-(4√2)² = 64-32 = 32
b = √32 = √(16·2) = √16·√2
b = 4√2
---------
P = ½ · a·h
h = b
P = ½ · 4√2 · 4√2
P = 16 [j²]
Obw. = a+b+c = 4√2 + 4√2 + 8 = 8√2+8
Obw. = 8(√2+1) [j]
==============
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Zad.2
-6
f(x) = ---------
x + 4
Funkcja homograficzna
a = 0, b = -6, c = 1, d = 4
a)
x+4 ≠ 0
x ≠ -4
D = R \ {-4}
========
b)
f(2) = -6/(2+4) = -6/6
f(2) = -1
======
c)
f(x) = 6
6 = -6/(x+4) I*(x+4)
6(x+4) = -6
6x + 24 = -6
6x = -6 - 24
6x = -30 /:6
x = -5
====
Odp. Dla argumentu: -5
d)
y ∈ R \ {a/c}
y ∈ R \ {0}
Zbiór wartości: R \ {0}
1 ∈ ZW
Zad.3
c = 8 - przeciwprostokątna
sinx = √2/2
a,b - przyprostokątne
P = ?
Obw. = ?
a/c = sinx
a = c·sinx
a = 8 · √2/2
a = 4√2
----------
Z tw. Pitagorasa:
a²+b² = c²
b² = c²-b² = 8²-(4√2)² = 64-32 = 32
b = √32 = √(16·2) = √16·√2
b = 4√2
---------
P = ½ · a·h
h = b
P = ½ · 4√2 · 4√2
P = 16 [j²]
========
Obw. = a+b+c = 4√2 + 4√2 + 8 = 8√2+8
Obw. = 8(√2+1) [j]
==============