一道英语数学题an open rectangular box with a square base is to be m

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/07/14 07:12:29

一道英语数学题
an open rectangular box with a square base is to be made from 48ft^2 material
i.write a formula for the Volume and the Surface Area of the box
ii.find the value of x for which V is maximum.

设底面边长为a,高为h,则
a+2h=48
i：V=a^2*h=a^2*(48-a)/2ft^3
S=a^2+4*a*h=a^2+4*a*(48-4)/2=a^2+2*a*(48-a)ft^2
ii：假如x指的是底面边长,则
V=x^2*h=x^2*(48-x)/2求导
V'=48x-3x^2/2,当V'=0时,有
x=0ft(显然不合适,舍去),或x=32ft为所求

一道英语数学题an open rectangular box with a square base is to be m 请教一道英文数学题?题目如下:A rectangular box without a lid has volume 0. A display case is in the shape of a rectangular box with a s open the square box Tian'anmen Square which is open to everyone is open is a p-- Packing is open box with a hanging hole 急英语翻译1,A rectangular field is to be fenced off along the bank Movies used to be shown in an open space in our town ,with a 高数微积分题一道The base of a circular fence with radius 10 m is giv I'm going to be a doctor.Be there or be square.为什么加be? SAT2数学题一道,if a square prism is inscribed in a right circular sat一道数学题On a square gameboard that is divided into n row of