Question

设

x

3

=

y

4

=

z

2

，则

x-2y+3z

x-3y-z

=______．

Answer 1

设

x

3

=

y

4

=

z

2

=k，
则x=3k，y=4k，z=2k．
则

x-2y+3z

x-3y-z

=

3k-8k+6k

3k-12k-2k

=

k

-11k

=-

1

11

．
故答案为-

1

11

．