题目内容
已知
=1,
=2,
=3,则x的值为______.
| xy |
| x+y |
| yz |
| y+z |
| zx |
| z+x |
已知
=1,
=2,
=3,则:
=1,即
+
=1;(1)
=
,即
+
=
;(2)
=
,即
+
=
.(3)
(2)-(3)得到:
-
=
(4)
(1)-(4)得到:
=
,
解得:x=
.
故答案为:
.
| xy |
| x+y |
| yz |
| y+z |
| xz |
| z+x |
| x+y |
| xy |
| 1 |
| y |
| 1 |
| x |
| y+z |
| yz |
| 1 |
| 2 |
| 1 |
| y |
| 1 |
| z |
| 1 |
| 2 |
| x+z |
| xz |
| 1 |
| 3 |
| 1 |
| x |
| 1 |
| z |
| 1 |
| 3 |
(2)-(3)得到:
| 1 |
| y |
| 1 |
| x |
| 1 |
| 6 |
(1)-(4)得到:
| 2 |
| x |
| 5 |
| 6 |
解得:x=
| 12 |
| 5 |
故答案为:
| 12 |
| 5 |
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已知
=1,
=2,
=3,则x的值是( )
| xy |
| x+y |
| yz |
| y+z |
| xz |
| z+x |
| A、1 | ||
B、
| ||
C、
| ||
| D、-1 |