m+n |
m-n |
m+n |
n-m |
m+1 |
n+1 |
m+1 |
n+1 |
m+n |
m-n |
2m |
m-n |
2m |
m-n |
m-n |
2m |
m+n |
n-m |
2n |
n-m |
2n |
n-m |
m-n |
2m |
2n |
n-m |
-(m-n)2-4mn |
2m(n-m) |
(m+n)2 |
2m(n-m) |
m+n |
m-n |
m+n |
n-m |
5 |
5 |
5 |
1 |
1+a |
1 |
1-a |
1 |
xn+2 |
11 |
7 |
1 |
x-2 |
ab |
2ab |
a+b |
2 |
ab |
A.①③ | B.①④ | C.②③ | D.②④ |
a |
b |
c |
d |
1 |
e |
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