题目内容
设a,b∈R+,且a+b=1,求证:(a+
证明:(12+12)[(a+
)2+(b+
)2]
≥[(a+
)+(b+
)]2
=[1+(
+
)]2
=(1+
)2≥25(∵ab≤
),
∴(a+
)2+(b+
)2≥
.
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题目内容
设a,b∈R+,且a+b=1,求证:(a+
证明:(12+12)[(a+
)2+(b+
)2]
≥[(a+
)+(b+
)]2
=[1+(
+
)]2
=(1+
)2≥25(∵ab≤
),
∴(a+
)2+(b+
)2≥
.