1,点（a,b）在直线x+2y=3上移动,则2^a+4^b的最小值是?2,设0

1,点（a,b）在直线x+2y=3上移动,则2^a+4^b的最小值是?2,设0
1,点（a,b）在直线x+2y=3上移动,则2^a+4^b的最小值是?2,设0

1,点（a,b）在直线x+2y=3上移动,则2^a+4^b的最小值是?2,设0
(1)点（a,b）在直线x+2y=3上移动,有
a+2b=3,a=3-2b.
2^a+4^b=2^(3-2b)+2^2b=(2^3/2^2b)+2^2b=8/2^2b+2^2b≥2√(8/2^2b*2^2b)=2*2√2=4√2.
则2^a+4^b的最小值是4√2.
(2)0