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问题
判断题
合理膳食是指各种营养物质的比例合适,互相搭配。[ ]
答案
√
解答题
已知函数f(x)=ax
2
+ln(x+1).
(1)求函数g(x)=f(x)-ax
2
-x的单调区间及最大值;
(2)当x∈[0,+∞)时,不等式f(x)≤x恒成立,求实数a的取值范围.
(3)求证:
(1+
1
2
2
)(1+
1
3
^
)(1+
1
4
2
)(1+
1
5
2
)…(1+
1
n
2
)<e
参考导数公式:
(ln(x+1)
)
′
=
1
x+1
.
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选择题
— What's the schedule for the 5th of November?
— A concert ______, Would you mind going with me?
A. holds
B. will hold
C. is held
D. will be held
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