A、a-(3b-2c-1)=a-3b+2c+1,此选项错误;
B、3x 3-[2x 2-(-4x+1)]=3x 3-2x 2-4x+1,此选项正确;
C、2x 2-3(x-1)=2x 2-3x+3,此选项错误;
D、-(2x-y)-(-a+2b)=-2x+y+a-2b,此选项错误.
故选B.
A、a-(3b-2c-1)=a-3b+2c+1,此选项错误;
B、3x 3-[2x 2-(-4x+1)]=3x 3-2x 2-4x+1,此选项正确;
C、2x 2-3(x-1)=2x 2-3x+3,此选项错误;
D、-(2x-y)-(-a+2b)=-2x+y+a-2b,此选项错误.
故选B.