设x/3=y/4=z/2,则x−2y+3zx−3y−z=_.
问题描述:
设
=x 3
=y 4
,则z 2
=______. x−2y+3z x−3y−z
答
设
=x 3
=y 4
=k,z 2
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