x-y |
xy |
a-b |
5 |
m-m2 |
m |
1+a |
π |
x-y |
xy |
m-m2 |
m |
a-b |
5 |
1+a |
π |
x2008+z2009-y2010 | ||
|
A.x≠0 | B.x≠0且x≠±402 |
C.x≠0且x≠402 | D.x≠0且x≠-402 |
1 | ||
|
1 |
a |
b |
3 |
c |
a-b |
2ab |
π |
x |
x2-y2 |
A.2个 | B.3个 | C.4个 | D.5个 |
-m |
1 |
m+1 |
A.m≤0 | B.m≤0,且m≠-1 | C.m≥0且m≠-1 | D.m≠-1 |
1 |
-x2+2x+c |
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