2X-X²-3=-(X-1)²-2
∵-(X-1)²≦0
∴-(X-1)²-2≦-2
配方法证明无论X取何值,代数式2X-X²-3的值恒小于零 急,额外急!
配方法证明无论X取何值,代数式2X-X²-3的值恒小于零 急,额外急!
数学人气:896 ℃时间:2019-11-09 05:10:06
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