
Củng cố CẤP SỐ CỘNG
Authored by Lê Thị Kim Hương
Mathematics
11th Grade
Used 1+ times

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6 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Dãy số nào sau đây KHÔNG phải là cấp số cộng?
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
un = u1 + d
un = u1 + (n + 1) d
un = u1 - (n - 1) d
un = u1 + (n - 1) d
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Cho cấp số cộng (un) có u1 = 3 và u2 = -1. Khi đó:
u3 = 4
u3 = 2
u3 = - 5
u3 = 7
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Cho cấp số cộng (un) có u1 = - 5 và d = 3. Chọn khẳng định ĐÚNG.
u18 = 50
u15 = 45
u13 = 31
u10 = 35
5.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
Cho cấp số cộng (un) có số hạng đầu u1 = - 1 và công sai d = 3. Khi đó S5 bằng
11
50
10
25
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Tìm x sao cho ba số 15 ; x và 31 theo thứ tự đó lập thành cấp số cộng.
x = 16
x = 23
x = 46
x = 64
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