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问题 填空题
积分
∫e1
(
1+2x2
x
)dx的值是______．
答案

∫e1
(
1+2x2
x
)dx=
∫e1
(
1
x
+2x)dx=（lnx+x2）
|e1
=（lne+e2）-（ln1+1）=e2

故答案为：e2

选择题
—The earth goes round the sun.
—What did he say? I couldn't hear him.
—_________.

A. He says the earth goes round the sun.
B. He said the earth goes round the sun.
C. He said the earth went round the sun.
D. He says the earth went round the sun.
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单项选择题

商朝“盘庚迁殷”中的“殷”位于现在的（）。

A.陕西省

B.河南省

C.湖北省

D.河北省
查看答案