
toán
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Others
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4th Grade
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Practice Problem
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Medium
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12 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Cho hàm số y = f (x) xác định với mọi 𝑥 ∈ R và có bảng xét dấu f '(x) như hình vẽ dưới đây.
(−5;+)
(-5,-4)
(−4;+).
(−;−4).
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Đồ thị hàm số nào dưới đây có dạng như đường cong trong hình vẽ?
.y= 2x phần 3x-3
Y=-x mũ 3+3x+2
Y= x+1 phần x-1
Y=x mũ 3-3x+2
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Vectơ nào dưới đây có điểm đầu là B và điểm cuối là A?
BA GẠCH ĐẦU
AA gạch đầu
AB gạch đầu
BB gạch đầu
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Cho tứ diện ABCD . Mệnh đề nào sau đây đúng?
.
.
AB+BC=AD gạch đầu hết
AB+BC=AC gạch đầu hết
AB+BC=BD gạch đầu hết
AB+BC=CA gạch đầu hết
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Cho hình hộp ABCD.A’B’C’D’ như hình vẽ. Phát biểu nào sau đây là đúng?
AB+AD+AA’=AC’
AB+AD+AA’=C’A
AB+AD+AA’=A’C
AB+AD+AA’=AC
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Trong không gian Oxyz , cho a=-i+ 2j-3k. Tạo độ của a là
(2;−1;−3).
(−1;2;−3).
(−3;2;−1).
(2;−3;−1).
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
TrongkhônggianOxyz,chohaiđiểmA(xA;yA;zA)vàB(xB;yB;zB).Mệnhđềnàosauđây đúng
AB= (xB.xA;yB.yA;zB.zA).
AB =(xB +xA;yB +yA;zB +zA).
AB=(xB −xA;yB −yA;zB −zA).
AB=xB.xA +yB.yA +zB.zA.
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