回答我问题的人才会心想事成!(x+y+z)(x-y-z)-(x-y+z)(x+y-z)
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/01 07:40:19
![回答我问题的人才会心想事成!(x+y+z)(x-y-z)-(x-y+z)(x+y-z)](/uploads/image/z/13780052-44-2.jpg?t=%E5%9B%9E%E7%AD%94%E6%88%91%E9%97%AE%E9%A2%98%E7%9A%84%E4%BA%BA%E6%89%8D%E4%BC%9A%E5%BF%83%E6%83%B3%E4%BA%8B%E6%88%90%21%EF%BC%88x%2By%2Bz%EF%BC%89%EF%BC%88x-y-z%EF%BC%89-%EF%BC%88x-y%2Bz%EF%BC%89%EF%BC%88x%2By-z%EF%BC%89)
回答我问题的人才会心想事成!(x+y+z)(x-y-z)-(x-y+z)(x+y-z)
回答我问题的人才会心想事成!
(x+y+z)(x-y-z)-(x-y+z)(x+y-z)
回答我问题的人才会心想事成!(x+y+z)(x-y-z)-(x-y+z)(x+y-z)
[x+(y+z)][x-(y+z)]-[x-(y-z)][x+(y-z)]=x^2-(y+z)^2-x^2+(y-z)^2=-4yz
=-2y的平方+2z的平方+2yz+2xy
过程省去,答案:-3y(x+z)