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(1)x2+12x+______=(x+6)2

(2)x2-10x+______=(x-______)2

(3)x2+8x+______=(x+______)2

答案

(1)x2+12x+36=(x+6)2

(2)x2-10x+25=(x-5)2

(3)x2+8x+16=(x+4)2

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