函数y=√5+2x-x²的最大值为

3个回答

y=√(5+2x-x²)
=√[-(x²-2x-5)]
=√[-(x²-2x+1)+6]
=√[-(x-1)²+6]
当x-1=0,即x=1时,函数y=√5+2x-x²取到最大值,最大值=√6