题目内容
(1+
+
+
)×(
+
+
+
)-(1+
+
+
+
)×(
+
+
).
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(1+
+
+
)×(
+
+
+
)-(1+
+
+
+
)×(
+
+
),
=[1+(
+
+
)]×(
+
+
+
)-[(1+(
+
+
+
)]×(
+
+
).
=(
+
+
+
)+(
+
+
)×(
+
+
+
)-(
+
+
)-(
+
+
+
)×(
+
+
),
═(
+
+
+
)-(
+
+
),
=
.
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=[1+(
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=(
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═(
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=
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