题目内容
化简
(1)(1-
)÷
(2)(
+
)÷
(3)(1+
)÷
.
(1)(1-
| y |
| y+x |
| x |
| y2-x2 |
(2)(
| a2 |
| a-3 |
| 9 |
| 3-a |
| a+3 |
| a |
(3)(1+
| 3 |
| a-2 |
| a+1 |
| a2-4 |
(1)原式=(
-
)•
=
•
=y-x;
(2)原式=
•
=
•
=a;
(3)原式=
•
=
•
=a+2.
| y+x |
| y+x |
| y |
| y+x |
| (y+x)(y-x) |
| x |
| x |
| y+x |
| (y+x)(y-x) |
| x |
(2)原式=
| a2-9 |
| a-3 |
| a |
| a+3 |
| (a+3)(a-3) |
| a-3 |
| a |
| a+3 |
(3)原式=
| a-2+3 |
| a-2 |
| (a+2)(a-2) |
| a+1 |
| a+1 |
| a-2 |
| (a+2)(a-2) |
| a+1 |
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