题目内容
(1)计算(-1)2+π0+3-1-
.
(2)计算(
+
)÷
).
| 4 |
(2)计算(
| 1 |
| x-y |
| 1 |
| x+y |
| xy |
| x2-y2 |
(1)原式=1+1+
-2
=
;
(2)原式=
•
=
.
| 1 |
| 3 |
=
| 1 |
| 3 |
(2)原式=
| 2x |
| x2-y2 |
| x2-y2 |
| xy |
=
| 2 |
| y |
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题目内容
| 4 |
| 1 |
| x-y |
| 1 |
| x+y |
| xy |
| x2-y2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 2x |
| x2-y2 |
| x2-y2 |
| xy |
| 2 |
| y |