问题
选择题
减去-3x得x2-3x+6的式子为( )
A.x2+6
B.x2+3x+6
C.x2-6x
D.x2-6x+6
答案
-3x+(x2-3x+6)
=-3x+x2-3x+6
=x2-6x+6
故选D.
减去-3x得x2-3x+6的式子为( )
A.x2+6
B.x2+3x+6
C.x2-6x
D.x2-6x+6
-3x+(x2-3x+6)
=-3x+x2-3x+6
=x2-6x+6
故选D.