(x+y)(a+b-c)-(x-y)(c-b-a) (要全过程,最好有文字解释)
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![(x+y)(a+b-c)-(x-y)(c-b-a) (要全过程,最好有文字解释)](/uploads/image/z/1798039-55-9.jpg?t=%28x%2By%29%28a%2Bb-c%29-%28x-y%29%28c-b-a%29+%28%E8%A6%81%E5%85%A8%E8%BF%87%E7%A8%8B%2C%E6%9C%80%E5%A5%BD%E6%9C%89%E6%96%87%E5%AD%97%E8%A7%A3%E9%87%8A%EF%BC%89)
(x+y)(a+b-c)-(x-y)(c-b-a) (要全过程,最好有文字解释)
(x+y)(a+b-c)-(x-y)(c-b-a) (要全过程,最好有文字解释)
(x+y)(a+b-c)-(x-y)(c-b-a) (要全过程,最好有文字解释)
原式=(x+y)(a+b-c)-(x-y)[-(a+b-c)] =(x+y)(a+b-c)+(x-y)(a+b-c) =(x+y+x-y)(a+b-c) =2x(a+b-c)