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

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

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

a+b

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

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

( )-(c-d)=(a-c)-(-b+d)
( )=a-c+b-d+c-d=a+b-2d
谢谢

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

右边=A-C+B-D=(A+B-2D)-(C-D)

右边=a-c-(d-b)=a-c-d b
=a b-(c d)=a b-c d-2d
=(a b-2d)-(c-d)
或=?