1750+70x-50x-2x^2=.=-2(x-5)^2+1800求详细解_数学解答

1750+70x-50x-2x^2=.=-2(x-5)^2+1800求详细解

人气：434 ℃　时间：2020-06-20 20:34:49

解答

1750+70x-50x-2x^2
=1750+20x-2x^2
=-2(x^2-10x)+1750
=-2(x^2-10x+25-25)+1750
=-2(x-5)^2+50+1750
=-2(x-5)^2+1800