题目内容
计算(
+
+
+
)-(1-
-
-
-
)-2(
+
+
+
+
)的结果是______.
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设(
+
+
+
)=a,
原式=a-(1-a)-2(a+
)
=a-1+a-2a-
=-
.
故答案为:-
.
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原式=a-(1-a)-2(a+
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=a-1+a-2a-
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=-
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故答案为:-
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