(x-y)³-x+y (a+b)²-(a-b)² (x-3)³-4x+12
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/30 02:37:50
![(x-y)³-x+y (a+b)²-(a-b)² (x-3)³-4x+12](/uploads/image/z/1730827-19-7.jpg?t=%EF%BC%88x-y%29%26%23179%3B-x%2By+%EF%BC%88a%2Bb%EF%BC%89%26%23178%3B-%EF%BC%88a-b%EF%BC%89%26%23178%3B+%28x-3%29%26%23179%3B-4x%2B12)
(x-y)³-x+y (a+b)²-(a-b)² (x-3)³-4x+12
(x-y)³-x+y (a+b)²-(a-b)² (x-3)³-4x+12
(x-y)³-x+y (a+b)²-(a-b)² (x-3)³-4x+12
(x-y)³-x+y
=(x-y)[(x-y)²-1]
=(x-y)(x-y+1)(x-y-1)
(a+b)²-(a-b)²
=(a+b+a-b)(a+b-a+b)
=2a*2b
=4ab
(x-3)³-4x+12
=(x-3)³-4(x-3)
=(x-3)[(x-3)²-1]
=(x-3)(x-3+1)(x-3-1)
=(x-3)(x-2)(x-4)
如果本题有什么不明白可以追问,