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(-2x+3)2=[-(________)]2=(________)2=________.
-2x+2y=()-2(x-y).
( )
x2-2x+1=0.
(2x+1)(2x-3)-(x+3)(5x+2)=-x2+6x+m,则m为
A.-21x-3
B.-27x-3
C.-27x-9
D.-27x+9
(2x+1)2-(x+3)2-(x-1)2=________.