x2 |
108 |
y2 |
4 |
xy |
3k |
x |
108y |
y |
4x |
1 |
3k |
∵不等式
x2 |
108 |
y2 |
4 |
xy |
3k |
∴
x |
108y |
y |
4x |
1 |
3k |
∴
1 |
3k |
|
1 | ||
|
∴3k≥
108 |
∴k≥
1 |
2 |
log | 63 |
1 |
2 |
log | 36 |
又∵總成立的必要不充分條件是k∈[m,+∞),
∴[
1 |
2 |
log | 63 |
∴正整數(shù)m只能取 1或2
故答案為:1或2
x2 |
108 |
y2 |
4 |
xy |
3k |
x2 |
108 |
y2 |
4 |
xy |
3k |
x |
108y |
y |
4x |
1 |
3k |
x2 |
108 |
y2 |
4 |
xy |
3k |
x |
108y |
y |
4x |
1 |
3k |
1 |
3k |
|
1 | ||
|
108 |
1 |
2 |
log | 63 |
1 |
2 |
log | 36 |
1 |
2 |
log | 63 |