证明:无论x、y为何值时,M=3x^2-8xy+9y^2-4x+6y+13恒为非负数
证明:无论x、y为何值时,M=3x^2-8xy+9y^2-4x+6y+13恒为非负数
数学人气:408 ℃时间:2019-12-16 11:32:55
优质解答
M=(2x^2-8xy+8y^2)+(x^2-4x+4)+(y^2+6y+9) =2(x-2y)^2+(x-2)^2+(y+3)^2 平方大于等于0 所以M>=0 所以M是0或正
我来回答
类似推荐
猜你喜欢
- 1i don't like coloured clothes,i like white__.
- 2元谋人、北京人、山顶洞人,半坡氏族、河姆渡氏族具体的区别,列表区分,
- 3x的负二次幂是多少
- 4一个游泳池,长50米,宽30米,如果每小时注入水,400立方米,多少时间才能是水深达1.8米
- 5英语4.______ is no possibility _____Bob can win the first prize in the match.
- 61.________in the heavy rain ,the man got wet through and shivered with cold.
- 7Every year,hundreds of thousands of people in the world die from smoring related disease.
- 8欧洲文艺复兴的实质是资产阶级的兴起吗
- 9This is an English book.(改为一般疑问句)
- 10Appear 反义词 Strong 名词 tall 比较级 important 最高级 blood 动词 a...