题目内容
不改变分式的值,使分式的分子、分母中的首项的系数都不含“-”号.
①
=______;
②
=______;
③
=______;
④
=______.
①
| -2x |
| -3y |
②
| 2x-1 |
| -x+1 |
③
| -x2+2x-1 |
| x-2 |
④
| -x-1 |
| -x2-3x+1 |
①
=
;
②
=
;
③
=
;
④
=
.
故答案为::①
; ②
;③
;④
.
| -2x |
| -3y |
| 2x |
| 3y |
②
| 2x-1 |
| -x+1 |
| 2x-1 |
| 1-x |
③
| -x2+2x-1 |
| x-2 |
| x2-2x+1 |
| 2-x |
④
| -x-1 |
| -x2-3x+1 |
| x+1 |
| x2+3x-1 |
故答案为::①
| 2x |
| 3y |
| 2x-1 |
| 1-x |
| x2-2x+1 |
| 2-x |
| x+1 |
| x2+3x-1 |
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