x+3y |
-3xy |
x-9y |
3xy |
A.-
| B.-
| C.
| D.-
|
x+3y |
-3xy |
x-9y |
3xy |
x-9y |
3xy |
x+3y |
3xy |
x-9y-(x+3y) |
3xy |
x-9y-x-3y |
3xy |
-12y |
3xy |
4 |
x |
a+1 |
a-1 |
1 |
2(a-1) |
A.1 | B.
| C.-
| D.
|
x2 |
x2-2xy+y2 |
y2 |
2xy-x2-y2 |
1 |
2m-6 |
3 |
m2-9 |
A.分式方程
| ||||||
B.站在M处看N处在北偏东30°的方向上,那么站在N处看M处在南偏西60°的方向上 | ||||||
C.已知M=
| ||||||
D.四边都相等的四边形是正方形 |
2m |
m2-4 |
1 |
m+2 |
3x-1 |
x2+2x-15 |
A |
x-3 |
B |
x+5 |
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