11 uždavinys
Taškas $$(2;\ \ \ \ \frac{4}{9})$$ priklauso funkcijos f(x) = ax grafikui. Kokia yra a skaitinė reikšmė?
A 3 B $$\frac{3}{2}$$ C 1 D $$\frac{2}{3}$$ E $$\frac{1}{3}$$
Sprendimas
a^2 =
| 4 |
| / 9 |
|
a^2 =
$$a^{2}$$ = $$\frac{4}{9}$$
| 4 |
| / 9 |
saknis( a^2) = saknis(
)$$\sqrt {a^{2}}$$ = $$\sqrt {\frac{4}{9}}$$
a^2) = saknis( | 4 |
| / 9 |
saknis(a^2) = a
a = saknis(
)$$a$$ = $$\sqrt {\frac{4}{9}}$$
| 4 |
| / 9 |
saknis(4/9) = 2/3
a =
$$a$$ = $$\frac{2}{3}$$
| 2 |
| / 3 |
$$a^{2}$$ = $$\frac{4}{9}$$
$$\sqrt {a^{2}}$$ = $$\sqrt {\frac{4}{9}}$$
$$a$$ = $$\frac{2}{3}$$
Atsakymas: D