(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)(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

(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)