问题 选择题
a
2
=
b
3
=
c
4
,则
a+2b+3c
a
等于(  )
A.8B.9C.10D.11
答案

a
2
=
b
3
=
c
4
=k,

则a=2k,b=3k,c=4k,

a+2b+3c
a

=

2k+2×3k+3×4k
2k

=

20k
2k

=10,

故选C.

听力题
单项选择题