题目内容
(1)解方程组:
(2)计算:(
-2
)×
-9
+2
.
|
(2)计算:(
| 6 |
| 15 |
| 3 |
|
| 45 |
(1)
,
由①得,x=
③,将③代入②得,3y+6=3+
,
解得:y=-
,则可得x=
,
即可得方程组的解为
.
(2)原式=
-2
-
+2
=3
-
=-
.
|
由①得,x=
| -2y-1 |
| 3 |
| 4y+2 |
| 3 |
解得:y=-
| 7 |
| 5 |
| 3 |
| 5 |
即可得方程组的解为
|
(2)原式=
| 18 |
| 45 |
9
| ||
| 2 |
| 45 |
=3
| 2 |
9
| ||
| 2 |
=-
3
| ||
| 2 |
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