问题 填空题

(1)x2+6x+______=(x+______)2

(2)x2-3x+______=(x-______)2

(3)x2______+16=(x______)2

答案

(1)x2+6x+9=(x+3)2

(2)x2-3x+

9
4
=(x-
3
2
2

(3)x2±8x+16=(x±4)2

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