代数式1x−1+1x+1+2xx2+1+4x3x4+1的化简结果是(  ) A.8x5x6−1 B.8x4x8−1 C.4x7x8−1 D.8x7x8−1

问题描述:

代数式

1
x−1
+
1
x+1
+
2x
x2+1
+
4x3
x4+1
的化简结果是(  )
A.
8x5
x6−1

B.
8x4
x8−1

C.
4x7
x8−1

D.
8x7
x8−1

1
x−1
+
1
x+1
+
2x
x2+1
+
4x3
x4+1

=
2x
x2−1
+
2x
x2+1
+
4x3
x4+1

=
4x3
x4−1
+
4x3
x4+1

=
8x7
x8−1

故选D.