题目内容
如果
+
=0.5,
+
+
=
,则
= .
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分析:把
+
看成一个整体,它的值是0.5,把0.5代入
+
+
=
中,求出
即可.
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解答:解:
+
=0.5,把它代入
+
+
=
,则:
0.5+
=
,
=
-0.5=
.
故答案为:
.
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0.5+
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故答案为:
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点评:把
+
看成一个整体,代入算式中,然后根据加法各部分的关系求解.
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