问题
填空题
已知a+3b=1,则2a+8b的最小值是______.
答案
∵8b=(23)b=23b,a+3b=1∴2a+8b=2a+23b≥2
=22a•23b
=22a+3b
.2
故答案为:2
.2
已知a+3b=1,则2a+8b的最小值是______.
∵8b=(23)b=23b,a+3b=1∴2a+8b=2a+23b≥2
=22a•23b
=22a+3b
.2
故答案为:2
.2