计算(a-b+c-d)(c-a-d-b)

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计算(a-b+c-d)(c-a-d-b)计算(a-b+c-d)(c-a-d-b)计算(a-b+c-d)(c-a-d-b)=(c-b-d+a)(c-b-d-a)=(c-b-d)^2-a^2

计算(a-b+c-d)(c-a-d-b)
计算(a-b+c-d)(c-a-d-b)

计算(a-b+c-d)(c-a-d-b)
=(c-b-d+a)(c-b-d-a)=(c-b-d)^2-a^2