题目内容
计算:
(1)
+
-
;
(2)a+2-
;
(3)
÷
;
(4)1-
÷
.
(1)
| 1 |
| 9x2 |
| 5 |
| 6x |
| 3 |
| 4x2 |
(2)a+2-
| 4 |
| 2-a |
(3)
| x2-4y2 |
| x2+2xy+y2 |
| x+2y |
| x2+xy |
(4)1-
| a-b |
| a+2b |
| a2-b2 |
| a2+4ab+4b2 |
(1)原式=
=
;
(2)原式=
=
;
(3)原式=
×
=
.
故答案为
、
、
.
| 4+30x-27 |
| 36x2 |
=
| 30x-23 |
| 36x2 |
(2)原式=
| a2-4+4 |
| (a-2) |
=
| a2 |
| a-2 |
(3)原式=
| (x+2y)(x-2y) |
| (x+y)2 |
| x(x+y) |
| x+2y |
=
| x2-2xy |
| x+y |
故答案为
| 30x-23 |
| 36x2 |
| a2 |
| a-2 |
| x2-2xy |
| x+y |
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