1 |
x |
1 |
y |
5x+3xy-5y |
x-2xy-y |
1 |
x |
1 |
y |
y-x |
xy |
5x+3xy-5y |
x-2xy-y |
5(x-y)+3xy |
(x-y)-2xy |
5×(-3xy)+3xy |
-3xy-2xy |
12 |
5 |
12 |
5 |
1 |
x |
1 |
y |
2x+5xy-2y |
x-2xy-y |
|x-1| |
x-1 |
x-3y |
x+y |
x |
y |
a2-1 |
1-a |
A.a+1 | B.a-1 | C.1-a | D.-1-a |
A.
| B.
| ||||||||
C.
| D.
|
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