
Test despre progresele aritmetice
Authored by Florentina Enea
Mathematics
9th Grade

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10 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Ce este o progresie aritmetica?
O progresie aritmetica este o succesiune de numere in care raportul dintre termenii consecutivi este constant.
O progresie aritmetica este o succesiune de numere in care fiecare termen este dublul termenului anterior.
O progresie aritmetica este o succesiune de numere in care suma termenilor consecutivi este constanta.
O progresie aritmetica este o succesiune de numere in care fiecare termen începând cu al doilea este obținut din termenul anterior la care se adaugă același număr constant numit rație.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Care este formula termenului general al unei progrese aritmetice?
a_n = a_1 / (n - 1) + d
a_n = a_1 - (n - 1) * d
a_n = a_1 + (n - 1) * d
a_n = a_1 * n + d
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Dacă a1 = 3 și d = 2, care este a5?
15
7
11
9
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Care este suma primelor n termeni ai unei progrese aritmetice?
S_n = n * a + d
S_n = n^2 * a
S_n = a + n * d
S_n = n/2 * (2a + (n - 1)d)
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Dacă a1 = 5 și a2 = 9, care este d?
4
3
8
6
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Care este termenul general al unei progrese aritmetice?
a_n = a_1 / (n - 1) + d
a_n = a_1 * n + d
a_n = a_1 + (n - 1) * d
a_n = a_1 - (n - 1) * d
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Dacă a1 = 10 și d = -1, care este a7?
5
7
4
3
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