x2+6x+______=(x+______)2,x2-3x+94=______.-数学

题目简介

x2+6x+______=(x+______)2,x2-3x+94=______.-数学

题目详情

x2+6x+______=(x+______)2,x2-3x+
9
4
=______.
题型:填空题难度:中档来源:不详

答案

∵6x=2×3•x,
∴x2+6x+9=(x+3)2,

x2-3x+class="stub"9
4
=(x-class="stub"1
2
)
2

故应填:9,3;(x-class="stub"3
2
)2.

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