1 |
a-1997 |
1 |
b+1998 |
1 |
c-1999 |
1 |
d+2000 |
A.a>c>b>d | B.b>d>a>c | C.c>a>b>d | D.d>b>a>c |
1 |
a-1997 |
1 |
b+1998 |
1 |
c-1999 |
1 |
d+2000 |
A.m,mn,mn2 | B.mn,mn2,m | C.mn2,mn,m | D.m,mn2,mn |
3 |
2 |
5 |
4 |
A.-60 | B.-36 | C.-90 | D.-30 |
2006×2007 |
2008×2009 |
2006×2008 |
2007×2009 |
2006×2009 |
2007×2008 |
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