1 |
x |
1 |
y |
1 |
x |
1 |
y |
x |
y |
y |
x |
1 |
xy |
x2y2+x2+y2+1 |
xy |
x2y2+(x+y)2-2xy+1 |
xy |
2 |
xy |
x+y |
2 |
1 |
4 |
1 |
4 |
1 |
x |
1 |
y |
2 |
t |
2 |
t |
1 |
,4 |
1 |
4 |
25 |
4 |
25 |
4 |
x2+8 |
x-1 |
A.4 | B.6 | C.8 | D.12 |
5 |
4 |
1 |
4x-5 |
A.有最小值3 | B.有最小值7 | C.有最大值3 | D.有最大值7 |
2 |
x-1 |
A.
| B.1 | C.
| D.2 |
2x(5-2x) |
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