题目内容
计算:(1+
+
+
)×(
+
+
+
)-(1+
+
+
+
)×(
+
+
)=______.
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设
+
+
=a,
+
+
+
=b,则原式变为:
(1+a)×b-(1+b)×a,
=b+ab-a-ab,
=b-a,
=
+
+
+
-(
+
+
),
=
;
故答案为:
.
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(1+a)×b-(1+b)×a,
=b+ab-a-ab,
=b-a,
=
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=
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故答案为:
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