已知x+y=3,4xy=3.求(x-y)ˇ2的值
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/01 23:11:15
![已知x+y=3,4xy=3.求(x-y)ˇ2的值](/uploads/image/z/8618366-38-6.jpg?t=%E5%B7%B2%E7%9F%A5x%2By%3D3%2C4xy%3D3.%E6%B1%82%EF%BC%88x-y%EF%BC%89%CB%872%E7%9A%84%E5%80%BC)
已知x+y=3,4xy=3.求(x-y)ˇ2的值
已知x+y=3,4xy=3.求(x-y)ˇ2的值
已知x+y=3,4xy=3.求(x-y)ˇ2的值
(x-y)^2
=x^2-2xy+y^2
=x^2+2xy+y^2-4xy
=(x+y)^2-4xy
=3^2-3
=9-3=6
根号6
(x-y)'2=x'2+y'2-2xy=(x+y)'2-4xy=9-3=6
(x-y)ˇ2=(x+y)ˇ2-4xy=9-3=6
(x-y)^2=x^2-2xy+y^2=(x+y)^2-4xy=9-3=6
(x-y)2=(x+y)2-4xy=9-3=6