3 |
5 |
2 |
3 |
1 |
m-n |
-3 |
m-n |
A.3 | B.4 | C.5 | D.6 |
3 |
5 |
2 |
3 |
1 |
m-n |
-3 |
m-n |
A.m+(-n+x-y)=m+n+x-y | B.a-2(b-c)=a-2b+2c |
C.a-2(b+c)=a-2b+c | D.m+(-n+x-y)=m+n+x+y |
A.不能运算 | B.-2 | C.-2yx2 | D.-2xy |
A.-5m2n+5nm2=0 | B.5x-x=5 |
C.3+2ab=5ab | D.x3-x=x2 |
A.3m2n3与-n3m2 | B.52yx与
| ||
C.122与-4
| D.62与x2 |
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