题目内容
若
+
+
=5,
+
+
=7,则
+
+
=______.
| 1 |
| x |
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| 3 |
| z |
| 3 |
| x |
| 2 |
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| 1 |
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| 1 |
| x |
| 1 |
| y |
| 1 |
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两式相加得,
+
+
=12,
等式两边都除以4,得
+
+
=3.
| 4 |
| x |
| 4 |
| y |
| 4 |
| z |
等式两边都除以4,得
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| x |
| 1 |
| y |
| 1 |
| z |
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