题目内容

What items do they enjoy buying most?Look at the people below and read the statements. Then watch Part 1 of the podcast and match the statements to each person.

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Give the gist of this recording in English and then in Chinese.

写出函数y=arccosex的复合过程

A. y=u u=arccosex
B. y=eu u=arccosx
C. y=arccosu u=ex
D. 都不对

写出函数y=(5x-3)10的复合过程( )

A. y=u u=(5x-3)10
B. y=5u-3 u=x10
C. y=u10 u=5x-3
D. 都不对

下列函数说法正确的是( )

A. 无穷小的倒数是无穷大
B. 两个无穷小的商是无穷小
C. 无穷小的极限为零
D. 无穷小是负无穷大