|
A.(1,10) | B.(5,6) | C.(10,15) | D.(20,24) |
1 |
5 |
1 |
5 |
|x|-1 |
|x-1| |
1-y2 |
t-4x2 |
A.0或1或2或3 | B.0或1或2或4 |
C.0或2或3或4 | D.0或1或2或3或4 |
A.2 | B.3 | C.1 | D.4 |
1 |
x |
A.当a<0时,x1+x2<0,y1+y2>0 |
B.当a<0时,x1+x2>0,y1+y2<0 |
C.当a>0时,x1+x2<0,y1+y2<0 |
D.当a>0时,x1+x2>0,y1+y2>0 |
© 2017-2019 超级试练试题库,All Rights Reserved.