2a2-8 |
a2-4a+4 |
ab-3a2 |
-b2+6ab-9a2 |
2a2-8 |
a2-4a+4 |
2(a+2)(a-2) |
(a-2)2 |
2(a+2) |
a-2 |
2×3 |
3-2 |
2a2-8 |
a2-4a+4 |
ab-3a2 |
-b2+6ab-9a2 |
a(b-3a) |
-(b-3a)2 |
a |
b-3a |
a |
2a-3a |
ab-3a2 |
-b2+6ab-9a2 |
A.当x=±3时,分式
| ||
B.当x=±2时,
| ||
C.当x≠2时,
| ||
D.x、y为任何有理数时,
|
4 |
a |
1 |
2 |
x |
3 |
x2-y2 |
x+y |
3x |
2π |
2 |
x |
x |
2x-3 |
x-1 |
x+2 |
5x |
x2+1 |
4x |
3 |
4 |
x+y |
x2+2 |
π+1 |
5 |
8 |
1 |
m |
1 |
x |
A.2个 | B.3个 | C.4个 | D.5个 |
x2 |
3 |
1 |
y+2 |
a2-1 |
a-1 |
3 |
m |
A.1个 | B.2个 | C.3个 | D.4个 |
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