题目内容
(1)x2______+9=(x-3)2
(2)x2+8x______=(x______)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,
故填+16,+4.
∴x2-6x+9=(x-3)2
故填:-6x;
(2)x2+8x+(
| 8 |
| 2 |
故填+16,+4.
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