已知x>0,x^2+4y^2=3,則x√(1+4y^2)的最大值?
已知x>0,x^2+4y^2=3,則x√(1+4y^2)的最大值?
RT
RT
數(shù)學(xué)人氣:769 ℃時間:2020-10-01 23:45:10
優(yōu)質(zhì)解答
∵x²+4y²=3∴x²+(1+4y²)=4∴x√(1+4y²)=√[x²(1+4y²)]≤[x²+(1+4y²)]/2=4/2=2當(dāng)且僅當(dāng)x²=1+4y²時,...
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