4²+3²>2×3×4,(-2)²﹢1>2×(-2)×1,(根号2)²+(½)²>2×根号二×½,2²+2²=2×2×2...通过观察归纳,写出能反映这种规律的一般结论,并加以说明理由练习册P24 T26
来源:学生作业帮助网 编辑:作业帮 时间:2024/08/26 23:57:13
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4²+3²>2×3×4,(-2)²﹢1>2×(-2)×1,(根号2)²+(½)²>2×根号二×½,2²+2²=2×2×2...通过观察归纳,写出能反映这种规律的一般结论,并加以说明理由练习册P24 T26
4²+3²>2×3×4,(-2)²﹢1>2×(-2)×1,(根号2)²+(½)²>2×根号二×½,2²+2²=2×2×2...通过观察归纳,写出能反映这种规律的一般结论,并加以说明理由
练习册P24 T26
4²+3²>2×3×4,(-2)²﹢1>2×(-2)×1,(根号2)²+(½)²>2×根号二×½,2²+2²=2×2×2...通过观察归纳,写出能反映这种规律的一般结论,并加以说明理由练习册P24 T26
a与b的平方和大于两倍的ab,因为完全平方公式a-b的平方等于a、b平方和加减2ab,因为一个数的平方大于等于0,所以得到那个公式.
注:你们学过这个了吗
4²+3²>2×3×4
(-2)²﹢1>2×(-2)×1
(根号2)²+(½)²>2×根号二×½
2²+2²=2×2×2
反映这种规律的一般结论: a²+b²≥2ab
因为 (a-b)²=a²+b²-2ab≥0
所以 a²+b²≥2ab
4²+3²>2×3×4
(-2)²﹢1>2×(-2)×1
(根号2)²+(½)²>2×根号二×½
2²+2²=2×2×2
反映这种规律的一般结论: a²+b²≥2ab
因为 (a-b)²=a²+b²-2ab≥0
所以 a²+b²≥2ab