Яка з послідовностей є геометричною прогресією?

Прогресії

Quiz
•
Mathematics
•
9th Grade
•
Easy
Алена Кухаренко
Used 3+ times
FREE Resource
11 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
3, 1/3, 9, 1/9, 27, 1/27
-1, 2, -4, 8, -16, 32
-5, -10,-15, -20, -25, -30
3, 0, 0, 0, 0
2.
MULTIPLE SELECT QUESTION
2 mins • 1 pt
(an) - арифметична прогресія. а4 =12, а5 =18. Знайти різницю d.
d = а5 - а4
d = 6
d = а4 - а5
d = -6
3.
MULTIPLE SELECT QUESTION
2 mins • 1 pt
(an) - арифметична прогресія. а1 = -3, d = 2. Знайти a6.
a6 = -3 + 2 *(6 - 1)
a6 = -3 * 25
a6 = 7
a6 = 2 * (-3)5
4.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
(an) - арифметична прогресія. а1 = 3, a5 = 13. Знайти S5.
(3 + 13) * 5 /2
(13 - 3) * 5 /2
(2 * 3 + 13) * 5 /2
(3 + 2 * 13) * 5 /2
5.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Яка із послідовностей є арифметичною прогресією?
3; 6; 12; 24;...
7; 10; 12; 13;...
-10; 0; 10; -10;...
20; 17; 14; 11
6.
FILL IN THE BLANK QUESTION
2 mins • 1 pt
Answer explanation
Знаходимо різницю прогресії: d=-6-(-8)=2.
Потім знаходимо п'ятий член за формулою n-го члена
7.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
4
12
36
108
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