先化简,后求值:1/4(-4x3+2x-8)-(1/2x-1),其中x在数轴上的对应点到原点的距离为1/2个单位长度.
先化简,后求值:
(-4x3+2x-8)-(x-1),其中x在数轴上的对应点到原点的距离为
个单位长度.
数学人气:213 ℃时间:2019-08-19 20:35:12
优质解答
原式=-x
3+
x-2-
x+1=-x
3-1,
又∵x到原点的距离为
个单位长度,
∴x=±
,
当x=
时,原式=-
-1=-
;
当x=-
时,原式=
-1=-
.
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