分解因试:(a-b)(x-y)-(b-a)(x+y)要过程!

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分解因试:(a-b)(x-y)-(b-a)(x+y)要过程!
分解因试:(a-b)(x-y)-(b-a)(x+y)要过程!

分解因试:(a-b)(x-y)-(b-a)(x+y)要过程!
(a-b)(x-y)-(b-a)(x+y)
=(a-b)(x-y)-[-(a-b)](x+y)
=(a-b)(x-y)+(a-b)(x+y)
=(a-b)[(x-y)+(x+y)]
=2x(a-b)

(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)

等于 2x(a-b)

(a-b)(x-y)-(b-a)(x+y)
=ax-ay-bx+by-bx-by+ax+ay
=2ax-abx

(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)

=(a-b)(x-y)+(a-b)(x+y)
=(a-b)(x-y+x+y)
=2x(a-b)

(a-b)(x-y)-(b-a)(x+y)
=ax-bx-ay+by-bx+ax-by+ay
=2ax-2bx