题目内容
化简:(1)
÷(3-x)•
;(2)(-
)2÷(-
)3•(-
)4
| x2+x-6 |
| x2+3x+9 |
| x2+3x+9 |
| x-2 |
| b |
| a |
| a |
| b2 |
| a |
| b2 |
(1)
÷(3-x)•
=
×
×
=-
;
(2)(-
)2÷(-
)3•(-
)4
=
×(-
)×
=-
.
| x2+x-6 |
| x2+3x+9 |
| x2+3x+9 |
| x-2 |
=
| (x+3)(x-2) |
| x2+3x+9 |
| 1 |
| 3-x |
| x2+3x+9 |
| x-2 |
=-
| x+3 |
| x-3 |
(2)(-
| b |
| a |
| a |
| b2 |
| a |
| b2 |
=
| b2 |
| a2 |
| b6 |
| a3 |
| a4 |
| b8 |
=-
| 1 |
| a |
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