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Teste-2008 - Fizică.trei.ro

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T E S T U L 14<br />

1. Mulţimea { x ∈ N | x 2 + x − 2 = 0}<br />

este egală cu:<br />

a) {1,2} b) {1} c) Ø d) {-2,1}<br />

x − x + 1<br />

2. Mulţimea numerelor reale x pentru care ≤ 1<br />

x 2 + x + 1<br />

56<br />

2<br />

e) {-2}<br />

este:<br />

a) R b) [1, + ∞)<br />

c) [0,∞ ) d) [-1, + ∞ ) e) Ø<br />

3. Minimul funcţiei de gradul al II-lea, f : R →R, f(x) = 2 1<br />

2 x − x + este:<br />

a) 1 b) 7 c) 1<br />

8<br />

4<br />

d) 0<br />

e) 2<br />

4. Fie polinomul f = X n X n<br />

n + 1 − ( + 1)<br />

+ , n ∈N<br />

* . Care din următoarele<br />

polinoame divide f ?<br />

a) X 3 − 1 b) X + 1 c) ( X − 1)(<br />

X + 1)<br />

5. Să se calculeze<br />

x − 2<br />

.<br />

→ 2 x − 16<br />

lim<br />

x 4<br />

d)<br />

( X − 1)<br />

3<br />

e) ( X − 1)<br />

2<br />

a) 1 b) 1 c) 1<br />

32 16<br />

4<br />

d) ∞ e) 1<br />

64<br />

[ 0,<br />

1]<br />

( 1,<br />

2]<br />

6. Fie f : [ 0,<br />

2]<br />

→ R,<br />

⎧x<br />

2,<br />

x ∈<br />

f ( x)<br />

= ⎨<br />

⎩2x<br />

− 1,<br />

x ∈<br />

. Care este valoarea<br />

⎛ 1 ⎞<br />

⎛ 3 ⎞<br />

expresiei E = f’ ⎜ ⎟ + f’(1)+ f’ ⎜ ⎟ ?<br />

⎝ 2 ⎠<br />

⎝ 2 ⎠<br />

a) 5 b) 3 c) 4 d) 6 e) 5<br />

2<br />

7. Să se calculeze x ( x + 1)<br />

1<br />

∫<br />

0<br />

2 .<br />

ln dx<br />

1<br />

a) ln2 b) 2ln2-1 c) ln2- d) 1<br />

2<br />

e) 4ln2

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