(a-b)²≥0
所以a²-2ab+b²≥0
2ab移到等号右边,即
a²+b²≥2ab,a=b时等号成立
猜你喜欢
- 1在三角形ABC中,AB:AC:BC,=1:1:根号2,直线L过点A且平行BC,D为L上一点,且BD=BC,BD交AC于点E,问CD=CE吗?
- 2北风卷地白草折,胡天八月即飞雪.忽如一夜春风来,千树万树梨花开.说明我国北方冬季风怎么样
- 3The___of a hotel room is about 80 yuan a night in Changchun
- 4线性代数:方阵属于矩阵吗?
- 5形容母爱的诗句...
- 6Jack started to work at__(a/an/the/ /)early age because his family was very poor..
- 7求加热铜绿的文字表达式+化学式
- 858成57分之2
- 9求同时满足6x+5/7小<4x+7和不等式8x+3>4x+10的整数解
- 10关于读书的名人事例