PROGRESII

PROGRESII

9th Grade

8 Qs

quiz-placeholder

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PROGRESII

PROGRESII

Assessment

Quiz

Mathematics

9th Grade

Practice Problem

Medium

Created by

crisan cristina

Used 1+ times

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8 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

Fie (an ) sir progresie aritmetica cu 

 a1=4 si r=12a_1=-4\ si\ r=\frac{1}{2}  . Termenul  a3a_3  este

 3-3  

 32\frac{3}{2}  

 1-1  

 72-\frac{7}{2}  

2.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

Fie sirul  (an)\left(a_n\right)  progresie aritmetica cu  a3a2=1a_3-a_2=-1  si  a2=3a_2=-3  . Atunci  a1a_1^{ }  

 a1=2a_1=-2  

 a1=4a_1=-4  

 a1=2a_1=2  

 a1=1a_1=-1  

3.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

Primul termen al unei progresiei aritmetice, daca 


 a10=131 si r=12a_{10}=131\ si\ r=12  este

 a1=23a_1=23  

 a1=130a_1=130  

 a1=23a_1=-23  

 a1=4a_1=4  

4.

MULTIPLE CHOICE QUESTION

10 mins • 1 pt

 a2a6+a4=7a_2-a_6+a_4=-7  si  a8a7=2a4a_8-a_7=2a_4  

Primul termen si ratia unei progresii aritmetice daca

 a1=5 si r=2a_1=-5\ si\ r=2  

 a1=5 si r=2a_1=5\ si\ r=-2  

 a1=3 si r=2a_1=3\ si\ r=2  

 a1=5 si r=1a_1=-5\ si\ r=1  

5.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

 x1, 2x+1, 5x7x-1,\ 2x+1,\ 5x-7  

Aflati x real astfel incat tripletul sa fie in progresie aritmetica

 x=5x=5  

 x=2x=2  

 x=3x=3  

 x=94x=\frac{9}{4}  

6.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

Fie sirul (bn)\left(b_n\right)  progresie geometrica cu b1=4 si q=12b_1=4\ si\ q=-\frac{1}{2}  . Atunci b3b_3  este

 b3=1b_3=1  

 b3=1b_3=-1  

 b3=2b_3=-2  

 b3=4b_3=-4  

7.

MULTIPLE CHOICE QUESTION

10 mins • 1 pt

 b2=8 si b4=32b_2=8\ si\ b_4=32  

Suma primilor 6 termeni pozitivi ai unei progresii geometrice in care

 S6=252S_6=252  

 S6=126S_6=126  

 S6=250S_6=250  

 S6=128S_6=128  

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