若多项式A减去-3x得到多项式x²-3x+6,则多项式A为[ ]A.x²-6x+6 B.x²+3x+6 C.x²-6x D.x²+6

若多项式A减去-3x得到多项式x²-3x+6,则多项式A为[ ]A.x²-6x+6 B.x²+3x+6 C.x²-6x D.x²+6
若多项式A减去-3x得到多项式x²-3x+6,则多项式A为[ ]
A.x²-6x+6 B.x²+3x+6 C.x²-6x D.x²+6

若多项式A减去-3x得到多项式x²-3x+6,则多项式A为[ ]A.x²-6x+6 B.x²+3x+6 C.x²-6x D.x²+6
A=(x^2 -3x+6)+(-3x)
=x^2 -6x+6
答案选A

选A