>
数学
>
先化简,后求值:
x
2
+2x−8
x
3
+
2x
2
+x
÷(
x−2
x
•
x+4
x+1
),其中x=-
4
5
.
人气:207 ℃ 时间:2019-11-01 11:18:27
解答
原式=
(x−2)(x+4)
x(x+1)
2
÷
(x−2)(x+4)
x(x+1)
=
(x−2)(x+4)
x(x+1)
2
×
x(x+1)
(x−2)(x+4)
=
1
x+1
,
当x=-
4
5
时,原式=
1
−
4
5
+1
=5.
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