Răspuns :
[tex]1)\left\{1,2\right\}\times\left\{a,b\right\}=\left\{(1,a),(1,b),(2,a),(2,b)\right\}[/tex]
[tex]2)f:\mathbb{R}\rightarrow\mathbb{R} \: \: \: ,f(x)=2x-3[/tex]
[tex]f(2) = 2 \times 2 - 3 = 4 - 3 = 1[/tex]
[tex]3)f:\mathbb{R}\rightarrow\mathbb{R} \: \: \: ,f(x)=2x-3[/tex]
[tex]f(a) = 3[/tex]
[tex]2 \times a - 3 = 3[/tex]
[tex]2a = 3 + 3[/tex]
[tex]2a = 6 \: | \div 2[/tex]
[tex]a = 3[/tex]
[tex]4)M(0,1)\:\in\:Oy[/tex]
[tex]5)f:A\rightarrow B = > A \: domeniu \: de \: definitie[/tex]
Răspuns:
Explicație pas cu pas:
1.
{1: 2} × {a; b} = {(1; a), (1; b), (2; a), (2; b)}
2.
f : R -> R, f(x) = 2x - 3, f(2) = ?
f(x = 2) = 2 * 2 - 3 = 1
f(2) = 1
3.
f: R -> R, f(x) = 2x - 3 f(a) = 3, a = ?
f(x = a) = 2 * a - 3 =3
2a - 3 = 3
2a = 6
a = 3
4.
M(0; 1) ∈ [tex]O_{x}[/tex] sau [tex]O_{y}[/tex]
M(x = 0, 1)
Daca x = 0 => M ∈ [tex]O_{y}[/tex]
5.
f: A -> B, multimea A se numeste - ?
Multimea A se numeste domeniu de definitie.