2022年下半年全国教师资格考试数学学科笔试白皮书（数学学科）答案.pdfVIP

目录

第四章巩固练习·········································································································1

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第四章巩固练习

（一）单选题

1

1．【答案】A．解析：依据无穷小性质：无穷小与有界函数的乘积还是无穷小，limxsin0．

x0x

111

2．【答案】B．解析：取a，b1，lima0,limb1，0＜1，而a1b0，ab，

nnnnnn1122

nn2

因此B的结论不正确．

sin(xx)

3．【答案】A．解析：lim01，∴与为等价无穷小，故选A．

sin(xx)xx

xx00

0xx

0

2n11

lim(nnn)limlim

4．【答案】D．解析：nn2n12，故选D．

nnn

11

n

ln(13x)3x3

5．【答案】B．解析：limlim，故选B．

x0sin2xx02x2

f(x)[a,b]

6．【答案】D．解析：已知在上连续，连续必有界，有界必有最大值A正确；闭区间函数连