Smile 發問於 科學及數學數學 · 1 年前

Maths problem, Quadratic function, thanks?

Attachment image

1 個解答

評分
  • 1 年前
    最愛解答

    a . Assume two squares sides are x cm,(60-4x)/4 =15-x cm ,total area is y

    >>>>y=x^2+(15-x^2)=2x^2-30x+225=2(x^2-15x+56.25)-56.25*2+225=2(x-7.5)^2+

    112.5 when x=7.5 ,there is a min=112.5 of y#

    b .7.5*4=30,60-30=30#

    p.s my English is pretty limited

還有問題嗎?立即提問即可得到解答。