题目内容
正数m,n满足2m+n=1,则
+
的最小值为______.
| 1 |
| m |
| 2 |
| n |
∵正数m,n满足2m+n=1,
∴
+
=(
+
)(2m+n)
=2+
+
+2
≥4+2
=8.
当且仅当
=
,即m=
,n=
时,
+
取最小值8.
故答案为:8.
∴
| 1 |
| m |
| 2 |
| n |
| 1 |
| m |
| 2 |
| n |
=2+
| 4m |
| n |
| n |
| m |
≥4+2
|
=8.
当且仅当
| 4m |
| n |
| n |
| m |
| 1 |
| 4 |
| 1 |
| 2 |
| 1 |
| m |
| 2 |
| n |
故答案为:8.
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