x2+8x+______=(x+______)2;x2-32x+______=(x-______)2-数学

题目简介

x2+8x+______=(x+______)2;x2-32x+______=(x-______)2-数学

题目详情

x2+8x+______=(x+______)2;x2-
3
2
x+______=(x-______)2
题型:填空题难度:中档来源:不详

答案

∵8x=2×4•x,
∴x2+8x+16=(x+4)2;

class="stub"3
2
x=2×class="stub"3
4
•x,
∴x2-class="stub"3
2
x+class="stub"9
16
=(x-class="stub"3
4
)2.

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