已知2a+3b=1,求5-4a-6b的值

问题描述:

已知2a+3b=1,求5-4a-6b的值
急用!

2a+3b=1两边乘以2,
4a+6b=2
5-4a-6b
=5-(4a+6b)
=5-2
=3