
S2-4.2-Ch4 多項式因式分解
Authored by Hoi Wong
Mathematics
8th Grade
Used 5+ times

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1.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
49. 下列何者的其中一個因式是 x – y?
I. x2 – y2
II. x2 + 2xy + y2
III. x2 – 2xy + y2
A. 只有I及II
B. 只有I及III
C. 只有II及III
D. I、II及III
A
B
C
D
Answer explanation
49. 對於I,
x2 – y2 = (x + y)(x – y)
對於II,
x2 + 2xy + y2 = (x + y)2
對於III,
x2 – 2xy + y2 = (x – y)2
∴ 答案是B。
2.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
50. 25a2 – 4 =
A. (5a + 2)(5a – 2)。
B. (–5a + 2)(5a – 2)。
C. – (5a + 2)(5a – 2)。
D. – (–5a + 2)(5a – 2)。
A
B
C
D
Answer explanation
50. 25a2 – 4
= (5a)2 – 22
= (5a + 2)(5a – 2)
∴ 答案是A。
3.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
51. –81h2 + k2 =
A. (9h + k)(9h – k)。
B. (–9h + k)(9h – k)。
C. – (9h + k)(9h – k)。
D. – (–9h + k)(9h – k)。
A
B
C
D
Answer explanation
51. –81h2 + k2
= –(81h2 – k2)
= –[(9h)2 – k2]
= –(9h + k)(9h – k)
∴ 答案是C。
4.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
52. –b2 – 10b – 25 =
A. – (b + 5)2。
B. – (b – 5)2。
C. – (b + 5)(b – 5)。
D. (b + 5)(b – 5)。
A
B
C
D
Answer explanation
52. –b2 – 10b – 25
= –(b2 + 10b + 25)
= –[b2 + 2(b)(5) + 52]
= –(b + 5)2
∴ 答案是A。
5.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
53. 64m2 + 169n2 + 208mn =
A. (8m + 13n)2。
B. (8m – 13n)2。
C. (8m + 13n)(8m – 13n)。
D. – (8m + 13n)(8m – 13n)。
A
B
C
D
Answer explanation
53. 64m2 + 169n2 + 208mn
= 64m2 + 208mn + 169n2
= (8m)2 + 2(8m)(13n) + (13n)2
= (8m + 13n)2
∴ 答案是A。
6.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
54. 25 – (3x + 2y)2 =
A. (5 + 3x + 2y)(5 – 3x – 2y)。
B. (5 + 3x – 2y)(5 – 3x – 2y)。
C. (5 + 3x + 2y)(5 – 3x + 2y)。
D. (5 + 3x – 2y)(5 – 3x + 2y)。
A
B
C
D
Answer explanation
54. 25 – (3x + 2y)2
= 52 –(3x + 2y)2
= [5 + (3x + 2y)][5 –(3x + 2y)]
= (5 + 3x +2y)(5–3x –2y)
∴ 答案是A。
7.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
55. (2a + b)2 – (a – 2b)2 =
A. (3a + b)(a – 3b)。
B. (3a – b)(a + 3b)。
C. (3a – b)(a – b)。
D. 3(a + b)(a – b)。
A
B
C
D
Answer explanation
55. (2a + b)2 – (a – 2b)2
=[(2a+b)+(a–2b)][(2a+b)–(a–2b)]
=(2a +b +a–2b)(2a +b–a+2b)
=(3a – b)(a + 3b)
∴ 答案是B。
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