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 |