题目内容
若A(
+x)(-
+x)=x4-
,则A=______.
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∵(
+x)(-
+x)=x2-
,
(x2+
)(x2-
)=x4-
,
∴A=x2+
.
故答案为:x2+
.
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(x2+
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∴A=x2+
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故答案为:x2+
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