题目内容
计算:
(1)-3mn÷
(2)
÷
(3)
•
.
(1)-3mn÷
| 2n2 |
| 3m |
(2)
| x2-2x+1 |
| x2-1 |
| x-1 |
| x2+x |
(3)
| 2m-6 |
| 4-4m+m2 |
| m2+6m+9 |
| 3-m |
(1)原式=-3mn•
=-
;
(2)原式=
•
=x;
(3)原式=-
•
=-
.
| 3m |
| 2n2 |
=-
| 9m2 |
| 2n |
(2)原式=
| (x-1)2 |
| (x+1)(x-1) |
| x(x+1) |
| x-1 |
=x;
(3)原式=-
| 2(m-3) |
| (m-2)2 |
| (m+3)2 |
| m-3 |
=-
| 2(m+3)2 |
| (m-2)2 |
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