若3a2-a-2=0,则5+2a-6a2=_.

问题描述:

若3a2-a-2=0,则5+2a-6a2=______.

解;∵3a2-a-2=0,∴3a2-a=2,
∴5+2a-6a2=5-2(3a2-a)=5-2×2=1.
故答案为:1.