
Quizizz bài giảng 4
Authored by Kim Hoài Hoàng
Mathematics
8th Grade

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5 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 2 pts
Câu 1: Chọn câu đúng
A. (A+B)2=A2+2AB+B2
B. (A+B)2=A2+AB+B2
C. (A+B)2=A2+B2
(A+B)2=A2−2AB+B2
2.
MULTIPLE CHOICE QUESTION
30 sec • 2 pts
Câu 2: Chọn câu đúng
A. (A−B)(A+B)=A2+AB+B2
B. (A−B)(A+B)=A2−B2
C. (A−B)(A+B)=A2−AB+B2
D. (A−B)(A+B)=A2+B2
3.
MULTIPLE CHOICE QUESTION
30 sec • 2 pts
Câu 3: Chọn câu đúng
A. (a-b)3=a3–3ab(a-b)-b3
B. (a-b)3=a3–3ab(a+b)–b3
C. (a-b)3=a3–ab(a-b)–b3
D. (a-b)3=a2–3ab(a-b)–b2
Answer explanation
(a-b)3=a3–3ab(a-b)-b3
=>(a-b)3=a3–3a2b+3ab2-b3
4.
MULTIPLE CHOICE QUESTION
1 min • 2 pts
Câu 4: Viết biểu thức x3+12x2+48x+64 dưới dạng lập phương của một tổng
A. (x−8)3
B. (x−4)3
C. (x+4)3
D. (x+8)3
Answer explanation
x3+12x2+48x+64
<=> x3+3.4x2+3.42x+43
<=>(x+4)3
5.
MULTIPLE CHOICE QUESTION
45 sec • 2 pts
Câu 5: Khai triển 4x2−25y2 theo hằng đẳng thức ta được:
A. (4x - 5y)(4x + 5y)
B. (4x - 25y)(4x + 25y)
C. (2x−5y)2
D. (2x -5y)(2x + 5y)
Answer explanation
4x2−25y2
<=> (2x)2- (5y)2
<=>(2x-5y)(2x+5y)
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