若多项式x5-(a-2)x3+5x2+(b+3)x-1中不含x3和x项,则a、b的值为( ) A.2,3 B.-2,3 C.-2,-3 D.2,-3
问题描述:
若多项式x5-(a-2)x3+5x2+(b+3)x-1中不含x3和x项,则a、b的值为( )
A. 2,3
B. -2,3
C. -2,-3
D. 2,-3
答
依题意有:
(1)-(a-2)=0,解得a=2;
(2)b+3=0,解得b=-3.
故选D.