题目内容
若
+
=75%，
+
+
=
，则c=
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12
12
．分析：根据
+
=75%，
+
+
=
，得出
=
-75%，据此解答即可．
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解答：解：因为
+
=75%，
+
+
=
，
所以
=
-75%=
-
=
，
所以c=12．
故答案为：12．
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所以
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所以c=12．
故答案为：12．
点评：解决此题的关键是根据
+
=75%、
+
+
=
得出
的值，进而求出c的值．
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| 1 |
| c |
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