计算 (a-b)(2x-y)+(a+b)(2y-x)

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

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

计算 (a-b)(2x-y)+(a+b)(2y-x)
(a-b)(2x-y)+(a+b)(2y-x)
=2ax-ay-2bx+by+2ay-ax+2by-bx
=ax+ay-3bx+3by

=2ax-2bx-ay+by+2ay+2by-ax-bx
=ax-3bx+ay+3by