x2+3x+______=(x+______)2;x2-43x+______=(x+______)2.-数学

题目简介

x2+3x+______=(x+______)2;x2-43x+______=(x+______)2.-数学

题目详情

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

答案

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

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