(a-b)(x-y)-(b-a)(x+y)等于(用因式分解)
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(a-b)(x-y)-(b-a)(x+y)等于(用因式分解)
(a-b)(x-y)-(b-a)(x+y)等于(用因式分解)
(a-b)(x-y)-(b-a)(x+y)等于(用因式分解)
(a-b)(x-y)-(b-a)(x+y)
=(a-b)(x-y)+(a-b)(x+y)
=(a-b)[(x-y)+(x+y)]
=(a-b)(2x)
=2x(a-b)
2x(a-b)
(a-b)*2x
(a-b)(x-y)-(b-a)(x+y)
=(a-b)(x-y)+(a-b)(x+y)
=(a-b)(x-y+x+y)
=2x(a-b)
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(a-b)(x-y)-(b-a)(x+y)
因式分解,(a-b)(x-y)-(b-a)(x-y)(a-b)(x-y)-(b-a)(x+y)