250a3b |
343x4y3 |
(3-π)2 |
1-6x+9x2 |
1 |
3 |
(x-3)2 |
(1-x)2 |
250a3b |
25×10a2•ab |
10ab |
10ab |
343x4y3 |
72×7(x2)2y2• y |
7y |
7y |
(3-π)2 |
1 |
3 |
1-6x+9x2 |
(1-3x)2 |
(x-3)2 |
(1-x)2 |
k |
2 |
1-
|
1 |
y |
xy3 |
|
A.
| B.
| ||||||||||||
C.当a≥3时,
| D.(-
|
500 |
12x |
4
|
|
A.(
| B.
| ||||||
C.
| D.若a2=b2,则
|
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