4x |
x2-4 |
a |
x+2 |
b |
x-2 |
A.-6 | B.6 | C.-2 | D.2 |
2 |
a2+b2-c2 |
2 |
b2+c2-a2 |
2 |
c2+a2-b2 |
1 |
x |
1 |
y |
2x-3xy+2y |
x+2xy+y |
2xy |
x+y |
1 |
a2-b2 |
yz |
y+z |
1 |
a2 |
2xz |
x+z |
1 |
a2+b2 |
xyz |
xy+yz+zx |
1 |
10 |
x |
y |
2 |
7 |
x2-3xy+2y2 |
2x2-3xy+7y2 |
A.
| B.
| C.
| D.
|
2 |
a |
1 |
b |
2a+b |
a-b |
A.-5 | B.5 | C.-4 | D.4 |
© 2017-2019 超级试练试题库,All Rights Reserved.