题目内容
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考点:分数的拆项
专题:分数和百分数
分析:把
+
=
代入
+
+
=
中,可得
+
=
,所以
=
-
=
,所以C=3.
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| C |
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解答:
解:因为
+
=
,
+
+
=
,
所以
+
=
,
所以
=
-
=
,所以C=3.
故答案为:√.
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| B |
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| 2 |
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所以
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所以
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故答案为:√.
点评:运用代入法求得
的值,是解答此题的关键.
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