问题 填空题
填上适当的数,使下面各等式成立:
(1)x2+3x+______=(x+______)2
(2)______-3x+
1
4
=(3x______)2
(3)4x2+______+9=(2x______)2
(4)x2-px+______=(x-______)2
(5)x2+
b
a
x+______=(x+______)2
答案

(1)x2+3x+

9
4
=(x+
3
2
2

(2)9x2-3x+

1
4
=(3x-
1
2
)2;

(3)4x2+12x+9=(2x+3)2

(4)x2-px+

p2
4
=(x-
p
2
2

(5)x2+

b
a
x+
b2
4a2
=(x+
b
2a
2

故答案是

9
4
3
2
,9x2,-
1
2
,12x,+3,
p2
4
p
2
b2
4a2
b
2a

单项选择题
单项选择题