(1)x2______+9=(x-3)2(2)x2+8x______=(x______)2.-数学

题目简介

(1)x2______+9=(x-3)2(2)x2+8x______=(x______)2.-数学

题目详情

(1)x2______+9=(x-3)2
(2)x2+8x______=(x______)2
题型:填空题难度:中档来源:不详

答案

(1)∵(x-3)2=x2-6x+9,
∴x2-6x+9=(x-3)2
故填:-6x;

(2)x2+8x+(class="stub"8
2
)2
=(x+4)2,
故填+16,+4.

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