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Padova - Ustation

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Domanda 6. Quante soluzioni reali ha l’equazione x − 4=3 √ 2 − x?<br />

(a) Nessuna<br />

(b) Esattamente una<br />

(c) Esattamente due<br />

(d) Più di due<br />

Domanda 7. Sia x = 0. Allora<br />

log 10<br />

1<br />

100 1+x<br />

3x<br />

(a) x−2<br />

3x<br />

(b) − 2(1+x)<br />

3x<br />

3x (c) 2+2x<br />

(d) nessuna delle precedenti possibilità è corretta.<br />

Domanda 8. cos(100π/3) =<br />

(a) − √ 3/2<br />

(b) −1/2<br />

(c) 1/2<br />

(d) 1<br />

Domanda 9. Sia a =log 10(0, 09). Allora<br />

(a) −2

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