9(y-z)的平方-(3y+z)(-z+3y)
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/02 12:53:36
![9(y-z)的平方-(3y+z)(-z+3y)](/uploads/image/z/1095990-6-0.jpg?t=9%EF%BC%88y-z%EF%BC%89%E7%9A%84%E5%B9%B3%E6%96%B9-%EF%BC%883y%2Bz%EF%BC%89%28-z%2B3y%29)
9(y-z)的平方-(3y+z)(-z+3y)
9(y-z)的平方-(3y+z)(-z+3y)
9(y-z)的平方-(3y+z)(-z+3y)
解
9(y-z)²-(3y+z)(-z+3y)
=9(y²-2yz+z²)-(3y+z)(3y-z)
=9y²-18yz+9z²-9y²+z²
=10z²-18yz
9(y-z)^2-(3y+z)(-z+3y)
=9y^2-18yz+9z^2-(9y^2-z^2)
=9y^2-18yz+9z^2-9y^2+z^2
=10z^2-18yz