{ | x+2y=3k 2x-u=9k |
1 |
2 |
1 |
2 |
5 |
2 |
5 |
2 |
2 |
5 |
5 |
2 |
1 |
2 |
{ | x-1>0 4-2x≥0 |
{ | x=2 y=1 |
{ | ax-3y=-1 x+by=5 |
{ | x≤m x>3 |
b-a |
90% |
a+b |
90% |
{ | x=2 y=1 |
{ | ax+by=7 ax-by=1 |
1 |
5 |
{ | 2x+3>5 3x-2<4 |
{ | x-a≥0 3-2x≥-1 |
1 |
2 |
2-x |
3 |
1 |
2 |
{ | 3x−2y+z=3 2x+y−z=4 4x+3y+2z=−10 |
{ | 2x+5≤3(x+2) 2x-
|
1 |
ab |
1 |
(a+1)(b+1) |
1 |
(a+2004)(b+2004) |