问题
选择题
减去-4x等于3x2-2x-1的多项式为( )
A.3x2-6x-1
B.5x2-1
C.3x2+2x-1
D.3x2+6x-1
答案
设这个多项式为M,
则M=-4x+(3x2-2x-1)
=-4x+3x2-2x-1
=3x2-6x-1,
故选A.
减去-4x等于3x2-2x-1的多项式为( )
A.3x2-6x-1
B.5x2-1
C.3x2+2x-1
D.3x2+6x-1
设这个多项式为M,
则M=-4x+(3x2-2x-1)
=-4x+3x2-2x-1
=3x2-6x-1,
故选A.