DIGITALIADA . Lucrare scrisă- clasa a VIII-a - Quizizz

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DIGITALIADA . Lucrare scrisă- clasa a VIII-a

8th grade

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Mathematics

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Question 1
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Q.
Media aritmetică a numerelor 27 și 15 este
answer choices
42
27
15
21
<p>42</p>
alternatives
<p>27</p>
<p>15</p>
<p>21</p>
answer explanation
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Question 2
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Q.
Soluţia ecuaţiei 2x+5=25 este…………….………………
answer choices
5
10
-10
20
<p>5</p>
alternatives
<p>10</p>
<p>-10</p>
<p>20</p>
answer explanation
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Question 3
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Q.
Sub formă de interval:
answer choices
[3; 9]
(-3; 9)
[3; 9)
(3; 9]
{3,4,5,6,7,8,9}
<p>[3; 9]</p>
alternatives
<p>(-3; 9)</p>
<p>[3; 9)</p>
<p>(3; 9]</p>
<p>{3,4,5,6,7,8,9}</p>
answer explanation
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Question 4
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Q.
Suma numerelor întregi din intervalul [-4,3) este...
answer choices
0
-7
13
7
<p>0</p>
alternatives
<p>-7</p>
<p>13</p>
<p>7</p>
answer explanation
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Question 5
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Q.
Dintre numerele a și b mai mare este :
answer choices
a
b
sunt egale
nu se poate spune
<p>a</p>
alternatives
<p>b</p>
<p>sunt egale</p>
<p>nu se poate spune</p>
answer explanation
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Question 6
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Q.
În cubul ABCDA'B'C'D', numărul muchiilor este egal cu ... .
answer choices
4
8
12
16
<p>4</p>
alternatives
<p>8</p>
<p>12</p>
<p>16</p>
answer explanation
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Question 7
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Q.
Fie cubul ABCDA'B'C'D'. Dacă AA' = 3 cm, atunci P_ABB'A' = ... cm.
answer choices
12
16
9
12√2
<p>12</p>
alternatives
<p>16</p>
<p>9</p>
<p>12√2</p>
answer explanation
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Question 8
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Q.
Pentru cubul ABCDA'B'C'D', m(∢C'CB) este ... °.
answer choices
60
90
45
30
<p>60</p>
alternatives
<p>90</p>
<p>45</p>
<p>30</p>
answer explanation
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Question 9
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Q.
Cubul ABCDA'B'C'D' are muchia egală cu 3√2 cm. Atunci P_ACD' = ... cm.
answer choices
18
18√2
9√2
9
<p>18</p>
alternatives
<p>18√2</p>
<p>9√2</p>
<p>9</p>
answer explanation
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Question 10
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Q.
( 5 + a )²=
answer choices
25+5a+a²
25-10a+a²
25+10a+a²
25-a²
<p>25+5a+a<sup>2</sup></p>
alternatives
<p>25-10a+a<sup>2</sup></p>
<p>25+10a+a<sup>2</sup></p>
<p>25-a<sup>2</sup></p>
answer explanation
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Question 11
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Q. ( a + 4 )( a – 4 ) =
answer choices
a²+16
a²-4
a²-8a+16
a²-16
a<sup>2</sup>+16
alternatives
a<sup>2</sup>-4
a<sup>2</sup>-8a+16
a<sup>2</sup>-16
answer explanation
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Question 12
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Q. (4√5 - √3)² = ... .
answer choices
80-8√15
83-8√15
83-4√15
80-4√15
80-8√15
alternatives
83-8√15
83-4√15
80-4√15
answer explanation
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Question 13
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Q.
Rezultatul calculului este:
answer choices
√2+√3
-√2-4√3
-4√2-√3
0
<p><strong>√2+√3</strong></p>
alternatives
<p>-<strong>√2-4√3</strong></p>
<p>-4<strong>√2-√3</strong></p>
<p>0</p>
answer explanation
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Question 14
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Q.
Numărul a este:
answer choices
0
2
pătrat perfect
√2+√5
<p>0</p>
alternatives
<p>2</p>
<p>pătrat perfect</p>
<p><strong>√2+√5</strong></p>
answer explanation
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Question 15
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Q.
Fie VACBD o piramidă patrulateră regulată. Știind că VA=AB= 10cm, iar VO⊥(ABC), alegeți enunțurile adevărate
answer choices
P_VAB = 30 cm
m(∢CVA)=90°
AC = 10√2
VO = 1/2AC
A_VAC= 100 cm²
<p>P<sub>VAB</sub> = 30 cm</p>
alternatives
<p>m(∢CVA)=90°</p>
<p>AC = 10<strong>√2</strong></p>
<p>VO = 1/2AC</p>
<p>A<sub>VAC=</sub> 100 cm<sup>2</sup></p>
answer explanation
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