新人求助~~

maxz=m*[2*(1-x1)*(1-x2)*(1-x3)*(1-x4)+4*x3*(1-x4)+4*(1-x3)*x4+5*(1-x3)*(1-x4)]
m=(t-L/20)*h/4
h=-6.8314*L+431.8
t=0.3905*L-1.681
x1=-2.25*w+72.983
x2=-1.9814*w+62.612
x3=-3.93*w+126.55
x4=-2.08*w+66.4
w>=15
w<=25
L>=25
L<=42
这个用matlab应输入些啥？

f = @(x)(0.3905y-1.681-(-6.8314y+431.84)/20)(5(1-(-3.98x+126.55))(1-(-2.08x+66.4))+4(1-(-3.93x+126.55))(-2.08x+66.4)+4(1-(-2.08x+66.4)(-3.93x+126.55)+2(1-(-3.93x+126.55))(1-(-2.25x+72.983))(1-(-2.08x+66.4))(1-(-1.9814x+62.212)))
lb = [15;26];
ub = [25;41] ;
x0 = [0.5;0.6];
[x1,fval1] = fmincon(f,x0,[],[],[],[],lb,ub);
xmax2 = x1(1)
ymax=x1(2)
zmax2 = -fval1
这个应该如何改？

http://mcm.ustc.edu.cn/download.htm

高手吗