发布网友 发布时间:2024-10-24 15:17
共1个回答
热心网友 时间:2024-11-01 18:12
设三边:X,X+0.5,H
则:4(X+X+0.5+H)=14.8
2X+H=3.2
H=3.2-2X
V=X*(X+0.5)*H
=(X^2+0.5X)(3.2-2X)
=-2X^3+2.2X^2+1.6X
V'=-6x^2+4.4X+1.6=0
(3X+0.8)(X-1)=0
X=1
即当X=1,H=3.2-2X=1.2m时,
最大容积=-2X^3+2.2X^2+1.6X=-2+2.2+1.6=1.8 m^3