(a+b-c-d)*(a-b-c+d)=[(___)+(___)]*[(___)-(___)]?括号内填什么?

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(a+b-c-d)*(a-b-c+d)=[(___)+(___)]*[(___)-(___)]?括号内填什么?
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(a+b-c-d)*(a-b-c+d)=[(___)+(___)]*[(___)-(___)]?括号内填什么?
(a+b-c-d)*(a-b-c+d)=[(___)+(___)]*[(___)-(___)]?括号内填什么?

(a+b-c-d)*(a-b-c+d)=[(___)+(___)]*[(___)-(___)]?括号内填什么?
(a+b-c-d)*(a-b-c+d)=[(a-c)+(b-d)]*[(a-c)-(b-d)]
=(a-c)²-(b-d)²
=a²-2ac+c²-b²+2bd-d²

(a+b-c-d)*(a-b-c+d)=[(_a-c__)+(b-d___)]*[(_a-c__)-(_b-d__)]

(a+b-c-d)*(a-b-c+d)=[(a-c)+(b-d)]*[(a-c)-(b-d)]

(a+b-c-d)*(a-b-c+d)=[(a-c)+(b-d)]*[(a-c)-(b-d)]