
Progresia aritmetica
Authored by Claudia Croitor
Mathematics
9th Grade
Used 1+ times

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7 questions
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1.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
La o progresie aritmetica cunoastem a1 =-2 si r=3. a10 este
24
25
26
27
2.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
Daca a2 +a4 -a6 = -7 si a8 -a7 =2a4 atunci
a1=-5 si r=2
a1=5 si r=2
a1=2 si r=2
a1=3 si r=2
3.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
Daca a5+a8+a11+a14=30 atunci S18 este
120
150
135
175
4.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
Solutia ecuatiei
1+7+13+........+x=280 este
52
53
54
55
5.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
Solutia ecuatiei
(x+1)+(x+4)+(x+7)+......+(x+28)=155 este
1
2
3
4
6.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
Daca 3x-1, x2+6 si 11x+1 sunt in progresie aritmetica atunci x este
2 si 3
1 si 6
-2 si 4
-1 si 6
7.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
valoarea sumei
1+5+9+...........+2001 este
500500
501501
125125
510510
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