题目内容
请根据结合律、分配律计算:(
+
+
+…+
)(1+
+
+…+
)-(1+
+
+…+
)(
+
+
+…+
).
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设
+
+…+
=a,则原式=(a+
)(1+a)-(1+a+
)a=a(1+a)+
(1+a)-a(1+a)-
a=
.
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