添括号(a-b+c-d)(a+b-c-d)=[(a-d)-_______][(a-d)+______]

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添括号(a-b+c-d)(a+b-c-d)=[(a-d)-_______][(a-d)+______]添括号(a-b+c-d)(a+b-c-d)=[(a-d)-_______][(a-d)+_____

添括号(a-b+c-d)(a+b-c-d)=[(a-d)-_______][(a-d)+______]
添括号(a-b+c-d)(a+b-c-d)
=[(a-d)-_______][(a-d)+______]

添括号(a-b+c-d)(a+b-c-d)=[(a-d)-_______][(a-d)+______]
(a-b+c-d)(a+b-c-d)=[(a-d)-(b-c)][(a-d)+(b-c)]