
Lí thuyết toán vào 10

Quiz
•
Mathematics
•
9th Grade
•
Medium
༻Mira ツ༺
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55 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Giải hằng đẳng thức sau: (a + b)2
a3 + 3ab + b3
a2 + 2ab + b2
(a + b)(a - b)
a3 + 3a²b + 3ab² +b³
2.
FILL IN THE BLANK QUESTION
30 sec • 1 pt
√A có nghĩa khi nào
3.
FILL IN THE BLANK QUESTION
30 sec • 1 pt
1÷√A có nghĩa khi nào
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Cho tam giác ABC, AB=c, AC=b, BC=a. Phát biểu nào sau đây là đúng?
Góc A là góc đối của cạnh a
Góc B là góc đối của cạnh c
Góc B là góc đối của cạnh a
Góc C là góc kề của cạnh C
5.
MULTIPLE SELECT QUESTION
2 mins • 2 pts
Cho tam giác ABC vuông tại B, đường cao BH. Những phát biểu nào sau đây là đúng?
BC2 = AC.HC
BH2 = AB.AC
BC2 = AB2 + AC2
BH.AC=AH.CH
BH.AC=AB.BC
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Cho tam giác ABC, AB=c, AC=b, BC=a.
Phát biểu đúng về định lý cosin là:
a² = b² + c² - 2ab.cos(A)
(A là góc A)
a² = b² + c² + 2bc.cos(A)
a² = b² + c² - 2bc.sin(A)
a² = b² + c² - 2bc.cos(A)
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Hoàn thành biểu thức sau:
√(a²)=
a
a và -a
a nếu a<0
-a nếu a<0
A và D đúng
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