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在(x)10的展开式中,含x4项的系数为___________.
在(x)10的展开式中,含x4项的系数为___________.
在(x
)
10
的展开式中,含x
4
项的系数为___________.
答案
答案:-15
解析:
T
r+1
=
x
10-r
·(
)
r
·x
-r
=
·(
)
r
·x
10-2r
,当r=3时,T
4
=
(
)
3
·x
4
=-15x
4
,
∴含x
4
项的系数为-15.
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