若x/2=y/3=z/-5，求2x+y+3z/2x的值．

题目

若

x

2

答案

设

x

2

=

y

3

=

z

-5

=k，则x=2k，y=3k，z=-5k；
所以

2x+y+3z

2x

=

2×2k+3k+3×(-5)

2×2k

=

-8k

4k

=-2．