A.
| B.
| ||||||||
C.
| D.
|
y |
x |
x |
y |
y2+x2 |
xy |
2x+y |
3x+y |
2x |
3x |
x+y |
x2-y2 |
x+y |
(x+y)(x-y) |
1 |
x-y |
x2+y2 |
x+y |
(x+y)2 |
x+y |
A.
| B.
| ||||||||
C.
| D.
|
-z |
-yz |
-2 |
3x |
-2 |
-ab |
-5-y |
-x |
x-y |
a |
y-z |
b |
z-x |
c |
A.第一象限 | B.第二象限 | C.第三象限 | D.第四象限 |
x-2 |
|x-2| |
A.-1 | B.0 | C.1 | D.2 |
© 2017-2019 超级试练试题库,All Rights Reserved.