1 |
a |
1 |
b |
1 |
c |
A.是正数 | B.是负数 |
C.是零 | D.正负不能确定 |
1 |
|a| |
1 |
|c| |
1 |
a |
1 |
c |
1 |
b |
1 |
a |
1 |
b |
1 |
c |
1 |
a |
1 |
b |
1 |
c |
1 |
a+b-c |
A.a=b=c | B.a=b | C.a=c或b=c | D.a2+b2=c2 |
3x |
x-1 |
x |
x+1 |
x |
x2-1 |
1 |
a |
1 |
b |
1 |
a |
1 |
c |
1 |
a |
1 |
b |
1 |
d |
1 |
a |
1 |
b |
1 |
c |
1 |
a |
1 |
b |
1 |
c |
1 |
d |
a+b |
a-b |
b2+c2-a2 |
2bc |
c2+a2-b2 |
2ca |
a2+b2-c2 |
2ab |
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