(a+b)(c-d)等于?

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(a+b)(c-d)等于?(a+b)(c-d)等于?(a+b)(c-d)等于?ac-ad+dc-bdac-ad+bc-bdac-ad+bc-bd

(a+b)(c-d)等于?
(a+b)(c-d)等于?

(a+b)(c-d)等于?

ac-ad+dc-bd

ac-ad+bc-bd

ac-ad+bc-bd