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+
(3)4x2+______+9=(2x______)2; (4)x2-px+______=(x-______)2; (5)x2+
|
答案
(1)x2+3x+
=(x+9 4
)2;3 2
(2)9x2-3x+
=(3x-1 4
)2;1 2
(3)4x2+12x+9=(2x+3)2;
(4)x2-px+
=(x-p2 4
)2;p 2
(5)x2+
x+b a
=(x+b2 4a2
)2.b 2a
故答案是
,9 4
,9x2,-3 2
,12x,+3,1 2
,p2 4
,p 2
,b2 4a2
.b 2a