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34 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
câu 1 trong không gian oxyz cho vectơ om = 3y - 3j + k tọa độ điểm m là
A.M(2;-3;1)
B.M(3;-2;1)
C. M(-3;2;1)
D. M(-2;3;-1)
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
câu 2 trong không gian oxyz cho hai điểm ( 1; 1 ;- 2) và b (2; 2; 1) vectơ AB có tọa độ là
A. (-1;-1;-3)
B. (3;1;1;)
C. (1;1;3)
D. (3;3;-1)
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
câu 3 trong không gian oxyz hình chiếu vuông góc của điểm A(8;1;2) trên trục ox có tọa độ là
A. (0;1;0)
B. (8;0;0)
C.(0;1;2)
D. (0;0;2)
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
câu 4 trong không gian oxyz hình chiếu vuông góc của điểm M(3;1;-1) trên trục oy có tọa độ là
A. (3;0;-1)
B.(0;1;0)
C. (3;0;0)
D.(0;0;-1)
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
câu 5 trong không gian với hệ toạ độ xyz cho điểm A(2;2;1) tính độ dài đoạn thẳng OA
A. OA=√5
B. oa = 5
C. oa = 3
D. a = 9
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
câu 6 cho không gian oxyz cho hai điểm A (1;-2;-1) B(1;4;3) độ dài đoạn thẳng AB là
A. 2√13
B.√6
C. 3
D.2√3
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
cau 6 cho hình lập phương abcd.a'b'c'd' mệnh đề nào sau đây sai
A. AB + AD + AA'=AC'
B. AC = AB + AD
C .|AB|=|CD|
D. AB = CD
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