问题
填空题
(1)x2______+9=(x-3)2
(2)x2+8x______=(x______)2.
答案
(1)∵(x-3)2=x2-6x+9,
∴x2-6x+9=(x-3)2
故填:-6x;
(2)x2+8x+(
)2=(x+4)2,8 2
故填+16,+4.
(1)x2______+9=(x-3)2
(2)x2+8x______=(x______)2.
(1)∵(x-3)2=x2-6x+9,
∴x2-6x+9=(x-3)2
故填:-6x;
(2)x2+8x+(
)2=(x+4)2,8 2
故填+16,+4.