X + Y + Z = -2
两边平方得:
X² + Y² + Z² + 2XY + 2YZ + 2XZ = 4
X² + Y² + Z² + 2(XY + YZ + XZ) = 4
因为 XY + YZ + XZ = 1
所以 X² + Y² + Z² + 2 = 4
所以 X² + Y² + Z² = 2
X+Y+Z=-2,XY+YZ+XZ=1,则X的平方+Y的平方+Z的平方的值为
X+Y+Z=-2,XY+YZ+XZ=1,则X的平方+Y的平方+Z的平方的值为
数学人气:541 ℃时间:2019-11-10 12:06:54
优质解答
我来回答
类似推荐
猜你喜欢
- 1Will you attend the meeting “held 还是to be held”next Sunday?
- 2Now I am happy Thank you for your company
- 3甲要打一份稿件,实际用了20分钟,比原计划提前5分钟,实际工效提高了百分之几?
- 4左边一个山,右边一个谷,这是什么字?
- 5求英语阅读理解和完形填空
- 6根号x的二次方等于4,则x等于多少?
- 7( )does it take me from my school to yours?a.how long b.how far c.how much d.how many
- 8煤是一种化石燃料,用煤作燃料生成的二氧化硫气体会造成环境污染.
- 9i think __important for us to learn english well
- 10Please do not respond to this message.The only way to follow up is to click on the above link.