先化简,再求代数式(1/x+x+1/x)÷x+2/x2+x的值,其中x=3cos30°+1/2.
先化简,再求代数式
(+)÷的值,其中x=
cos30°+
.
数学人气:533 ℃时间:2020-04-06 03:45:48
优质解答
原式=
•
=
•
=x+1,
∵x=
cos30°+
=
×
+
=
+
=2,
∴原式=2+1=3.
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