A.
| B.
| C.
| D.
|
a |
b |
c |
d |
a+b |
b |
c+d |
d |
a+b |
c+d |
b |
d |
a |
b |
c2 |
d2 |
a+m |
b |
a |
b |
m |
b |
c+m |
d |
c |
d |
m |
d |
a |
b |
c |
d |
a+m |
b |
c+m |
d |
a+3 |
b+3 |
5 |
6 |
c |
d |
a |
b |
2 |
3 |
a+m |
b+m |
c |
d |
x |
y |
x |
2 |
y |
4 |
z |
5 |
x+2y-z |
2x-y+3z |
a |
2 |
b |
3 |
c |
4 |
a |
b |
c |
d |
A.ac=bd | B.ad=bc | C.a=c | D.b=d |
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