计算6a2-5a+3与5a2+2a-1的差,结果正确的是( ) A.a2-3a+4 B.a2-3a+2 C.a2-7a+2 D.a2-7a+4
问题描述:
计算6a2-5a+3与5a2+2a-1的差,结果正确的是( )
A. a2-3a+4
B. a2-3a+2
C. a2-7a+2
D. a2-7a+4
答
(6a2-5a+3 )-(5a2+2a-1)
=6a2-5a+3-5a2-2a+1
=a2-7a+4.
故选D.