a |
a+b+d |
b |
b+c+a |
c |
c+d+a |
d |
d+a+c |
a |
a+b+d |
b |
b+c+a |
c |
c+d+a |
d |
d+a+c |
a |
a+b+c+d |
b |
a+b+c+d |
c |
a+b+c+d |
d |
a+b+c+d |
a+b+c+d |
a+b+c+d |
a |
a+b+d |
b |
b+c+a |
c |
c+d+a |
d |
d+a+c |
a |
a+b |
b |
b+a |
c |
c+d |
d |
d+c |
x2-1 |
1-x2 |
A.-1≤x≤1 | B.x≥1或x≤-1 | C.0≤x≤1 | D.{-1,1} |
1 |
4 |
© 2017-2019 超级试练试题库,All Rights Reserved.