(x+y+a-b)(x-y+a+b)可变形为( )^2-( )^2.

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(x+y+a-b)(x-y+a+b)可变形为()^2-()^2.(x+y+a-b)(x-y+a+b)可变形为()^2-()^2.(x+y+a-b)(x-y+a+b)可变形为()^2-()^2.(x+a

(x+y+a-b)(x-y+a+b)可变形为( )^2-( )^2.
(x+y+a-b)(x-y+a+b)可变形为( )^2-( )^2.

(x+y+a-b)(x-y+a+b)可变形为( )^2-( )^2.
(x+a)^2-(y-b)^2
(x+y+a-b)(x-y+a+b)
=[(x+a)+(y-b)][(x+a)-(y-b)]
=(x+a)^2-(y-b)^2