1 |
a2-1 |
1 |
a3-1 |
1 |
a100-1 |
A.
| B.
| C.
| D.
|
1 |
a2-1 |
1 |
a3-1 |
1 |
a100-1 |
1 |
3(1×2) |
1 |
3(2×3) |
1 |
3(3×4) |
1 |
3(99×100) |
1 |
3 |
1 |
1 |
1 |
2 |
1 |
2 |
1 |
3 |
1 |
3 |
1 |
4 |
1 |
99 |
1 |
100 |
1 |
3 |
1 |
100 |
1 |
3 |
99 |
100 |
33 |
100 |
a2 |
b |
10a+5b-ab |
a+2b-5 |
a |
b |
1 |
x |
1 |
x |
1 | ||
1-x-
|
x2+
| ||||
x2+
|
x |
x2+x+1 |
x2 |
x4+x2+1 |
a |
b |
a |
c |
b+c |
b+c-a |
A.等边三角形 |
B.腰长为a的等腰三角形 |
C.底边长为a的等腰三角形 |
D.等腰直角三角形 |
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